Emergency toilets: what to use when the water's off (2026)
It's the bit of preparedness nobody wants to think about, but a burst main or a pumping-station power cut can leave you unable to flush — and human waste is a genuine health risk. A little sanitation kit turns a grim few days into a manageable one. Here's what actually works, from a £15 bucket to a proper portable toilet.
By Tom Rowland · Updated 18 July 2026 · 6 products, price-tracked
Before you buy
First, the thing to know: when the water's off, don't keep flushing — the cistern won't refill and you'll just fill the bowl. If the drains still work you can flush manually by pouring a bucket of non-drinking water in; but if the sewers are affected too, you need to contain waste instead. That's what this kit is for.
Three tiers cover it. Cheapest: a lidded bucket lined with a heavy-duty bag plus a solidifying/gelling waste bag or cat litter, and hand sanitiser. Middle: a folding toilet frame that takes the same bags but is far more comfortable. Best: a self-contained chemical toilet (like the Thetford Porta Potti) with a sealed waste tank and flushing water — the caravan and boat standard, genuinely civilised, but it needs emptying at a proper disposal point.
The consumables matter as much as the hardware: waste 'wag' bags that gel and neutralise odour, toilet fluid or bio-sachets for tank models, plus wipes, hand sanitiser and nappy sacks. Store a few days' worth per person — running out is the real failure mode.
Top pick: Cleanwaste GO Anywhere Toilet Bags (Wag Bags). The self-contained answer to going to the toilet when the mains are down: a NASA-developed gel locks waste solid for odour-free, spill-proof storage until you can bin it. Trusted by the US military and disaster agencies, it is about as foolproof as this category gets, though the per-bag cost mounts up in prolonged use.
| Option | Type | Capacity | Price | |
|---|---|---|---|---|
| Cleanwaste GO Anywhere Toilet Bags (Wag Bags)TOP PICK | Gelling waste bags (Poo Powder toilet kit) | 12 | £45.00at usual price | Check price → |
| Thetford Porta Potti 335 Portable Toilet | Portable chemical toilet (manual piston flush) | 27 | £85.00at usual price | Check price → |
| Elsan Blue Toilet Fluid 2L | Chemical waste-tank fluid (formaldehyde-free) | ~16 tank doses (2L; 60ml per 10L of tank) | £15.00at usual price | Check price → |
| Portable Bucket Toilet with Lid (camping) | Open bucket ('luggable loo') with snap-on seat lid | ~20 litres | £20.00at usual price | Check price → |
| Folding Portable Camping Toilet with Bags | Folding frame, bag-lined (no cassette) | 12 | £20.00at usual price | Check price → |
| Reusable Portable Urinal Bottle (unisex) | Reusable plastic bottle, leakproof screw/snap cap, with female adapter (unisex) | 1 litre (1000 ml) | £7.00at usual price | Check price → |
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Cleanwaste GO Anywhere Toilet Bags (Wag Bags)
Who it's for: A proven, no-plumbing loo solution for flats, vehicles and grab bags when the water or power is off.
The self-contained answer to going to the toilet when the mains are down: a NASA-developed gel locks waste solid for odour-free, spill-proof storage until you can bin it. Trusted by the US military and disaster agencies, it is about as foolproof as this category gets, though the per-bag cost mounts up in prolonged use.
- Genuinely proven, not a novelty: over 10 million kits used by the US military and FEMA since 1999.
- The Poo Powder gelling agent turns liquid waste solid and controls odour, so storage and transport stay hygienic and spill-proof.
- Fully self-contained: each kit includes the gel-loaded waste bag, a puncture-resistant zip-close disposal bag, toilet paper and a hand wipe, and the waste is landfill-approved. Each bag handles several uses before it needs sealing.
- Cost per use is high next to a DIY bucket-liner-and-cat-litter setup, and UK packs carry an import premium.
- Waste still goes to landfill rather than composting, and a larger pack takes up cupboard space.
Don't buy if You have a garden or the space for a simple twin-bucket or bucket-and-liner system, where bin bags and cat litter do much the same job for a fraction of the per-use cost. These kits earn their keep for flats, cars and grab bags where compactness and zero mess matter most, not as an everyday high-volume solution.
Thetford Porta Potti 335 Portable Toilet
Who it's for: Caravan, campervan and boat owners, or households wanting a compact self-contained loo for power cuts or a burst-main.
A well-proven, no-nonsense portable toilet that needs no power and empties cleanly via its rotating spout. The 335 is the compact model in the range, so it suits one or two people rather than a full household over several days.
- Reliable, long-established Thetford design with a hygienic rotating pour-out spout and secure lid latch
- Fully self-contained and light (around 3.5kg) with a 10L flush and 10L waste tank, no plumbing or power needed
- Simple manual piston flush that just works, with widely available spare parts and toilet fluids
- Modest waste capacity of roughly 27 flushes means frequent emptying if several people rely on it
- Needs toilet chemicals and a suitable disposal point (a proper waste dump or WC), which takes some planning in an emergency
Don't buy if Don't buy the 335 if a whole household may need it for days at a time; the taller 365 or a larger cassette model gives more capacity between empties.
Elsan Blue Toilet Fluid 2L
Who it's for: Keeping a caravan, motorhome or boat cassette/portable toilet's waste tank hygienic and odour-free.
A long-standing, dependable waste-tank treatment for chemical toilets, now in a formaldehyde-free formula that's kinder to septic systems. It does one job well and is stocked almost everywhere, which matters when you need a top-up mid-trip.
- Formaldehyde-free and safe for septic tanks, so gentler than older chemical fluids
- Effective at controlling odour and bacteria in the waste-holding tank
- Widely stocked across UK camping and DIY retailers, with clear 60ml-per-10L dosing
- The concentrated blue dye can stain hands, clothing or surfaces if spilt
- For best results you'll also want a separate rinse/pink fluid for the flush-water tank, which adds cost
Don't buy if You run a SOG-vented, composting or eco toilet, or prefer additive-free tank treatments - you simply won't need blue chemical fluid.
Portable Bucket Toilet with Lid (camping)
Who it's for: A cheap, foolproof backup loo for when the water or drains are off at home, or for festivals and touring.
A simple bucket with a snap-on seat and lid is one of the cheapest, most reliable pieces of emergency sanitation you can keep in a cupboard. Paired with heavy-duty liner bags and gelling sachets it does the job with no plumbing, though it is basic and offers none of the odour control of a proper cassette toilet.
- Very cheap and near-indestructible, with nothing to break or leak
- Works entirely off-grid with liner bags and gelling powder, so no water or chemicals needed
- Doubles as a storage bucket for other kit between emergencies
- No sealed odour trap or waste breakdown like a chemical cassette toilet, so it relies on liners and gel to stay tolerable
- The seat and comfort are basic, and disposal of used liners still needs thought
Don't buy if Don't buy this if you have the space and budget for a proper flushing chemical/cassette toilet and expect prolonged off-grid use, or if you won't stock the liner bags and gelling sachets it really needs to be pleasant.
Folding Portable Camping Toilet with Bags
Who it's for: A cheap, packable standby loo for the car, a festival, or a household water cut.
A lightweight folding frame that sits over disposable gel bags — genuinely handy to keep in the boot or a grab bag for when the water or drains are off. Build quality is basic and the seat sits fairly low, so treat it as an occasional-use backup rather than a caravan mainstay.
- Folds nearly flat and weighs around 1.5kg, so it stores easily in a car boot, cupboard or grab bag
- Bag-and-gel system needs no chemicals, water or cassette emptying — you just tie off and bin the liner
- Cheap and quick to set up, with a 150kg load rating that suits most adults
- The thin plastic frame feels flimsy and the seat sits low to the ground, so it is less steady than a rigid bucket or cassette unit
- The 12 supplied bags run out quickly and refill packs add to the ongoing running cost
Don't buy if you want a proper toilet for regular caravan or campervan use — a flushing cassette Porta Potti is far more comfortable and cheaper per use over the long run.
Reusable Portable Urinal Bottle (unisex)
Who it's for: A dignified toilet backup in the car, grab-bag, or during a water or power outage.
A cheap, reusable answer to the awkward problem of no working toilet: a 1-litre bottle with a leakproof cap and a female adapter that earns its place in a car or grab-bag. Build quality is basic, but for a few pounds it does exactly what is needed.
- Very inexpensive and reusable, so it costs little to keep one in each car and kit.
- Leakproof screw or snap cap and graduated markings make it practical for outages, long traffic delays, or limited mobility.
- Unisex with a female adapter, so a single item covers the whole household.
- The female adapter takes practice and can be messy; it is less foolproof than a purpose-shaped female urination funnel.
- Plastic and cap quality vary between sellers, so a very cheap one may feel flimsy.
Don't buy if Skip it if your plan already includes a bucket-style emergency toilet with waste bags and gel, which does the same job more comfortably; and for regular outdoor use women may prefer a dedicated stand-to-pee funnel.
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Common questions
What do I do if I can't flush the toilet?
Stop flushing (the cistern won't refill). If drains still work, flush manually with a bucket of non-drinking water. If the sewers are also affected, switch to containing waste in a lined bucket or portable toilet with gelling waste bags.
Is a bucket toilet actually hygienic?
Yes, if you use a liner plus a solidifying/gelling waste bag (or cat litter) to lock away liquid and odour, keep a lid on, and sanitise hands every time. It's the cheap version of what a chemical toilet does.
Chemical toilet, folding, or bucket — which should I get?
Bucket for a cheap short-outage baseline; folding frame for comfort at low cost; a chemical toilet (Porta Potti) if you camp, have mobility needs or want the most civilised option for a longer disruption. All three work — it's comfort vs cost.
How do I dispose of emergency toilet waste?
Gelling waste bags can go in general waste once sealed (check the product). Chemical-toilet tanks must be emptied at a proper chemical-disposal point (campsite or public disposal), never into a storm drain or garden. Never bury or fly-tip waste.
How many waste bags do I need per person?
Plan roughly 3–5 uses per person per day, so a few days for a household adds up quickly — a couple of boxes of gelling bags is a sensible store, plus wipes and sanitiser.
Do I need toilet chemicals?
Only for tank-style chemical toilets, where fluid breaks down waste and controls odour (bio/'green' versions are kinder to disposal points). Bucket and bag systems use gelling powder or cat litter instead.