How to Store Water for an Emergency: Containers and Carriers (UK Guide)

When the tap stops, or a boil-water notice lands, the problem is immediate and unglamorous: you still need to drink, cook, take medicines and flush the toilet, and there's no warning to go shopping. Burst mains in a cold snap, a supply contamination, a pump failure during a power cut — UK households lose water more often than most people expect, usually for hours but sometimes a day or more. A small store of clean water turns a genuine welfare problem into a minor inconvenience. This guide covers how much to keep, what to keep it in, and where the marketing is worth ignoring.

How much water do you actually need?

The usual planning figure is around 3 litres per person per day for drinking and basic cooking, with a further few litres for washing and hygiene if you can spare the space. For a short outage, a sensible minimum is three days: that's roughly 9 litres of drinking water per person, so about 27 litres for a couple, 45 to 54 litres for a family of four. Don't forget pets — a medium dog wants a litre or more a day. You don't need a bunker's worth; a few sealed containers in a cupboard covers the outages most households will ever see. If you have the room, storing a week's supply is a reasonable step up and still fits under a bed or in a garage.

Jerry cans and rigid carriers

A rigid, food-grade jerry can in the 10 to 25 litre range is the backbone of most home water stores. It stacks, it survives being knocked about, and a good one has a decent tap or spout so you can draw water without heaving the whole thing over a sink. Look for one clearly marked food-grade or BPA-free, with a wide filler for cleaning and a cap that actually seals. Blue is the convention for drinking water and helps you tell it apart from fuel or waste cans at a glance. The trade-off is that a full 25-litre can weighs 25 kg — fine standing in a cupboard, awkward to carry — so two smaller cans are often more practical than one large one, especially for older or less mobile people.

Collapsible carriers and water bags

Collapsible carriers fold flat when empty, so they cost you almost no storage space until you need them. That makes them ideal for flats, small kitchens and the boot of the car, and for the specific job of fetching water — from a neighbour, a standpipe or a bowser — during a longer outage. The catch is that they're less durable than rigid cans, the taps can be flimsy, and they don't stack when full. The sensible approach is to keep some water already stored in rigid containers and keep a collapsible carrier or two on hand for topping up and transport. Check the seams and tap on a cheap one before you rely on it.

Bottled water and the everyday store

Shop-bought bottled water is the simplest option and needs no thought: it's sealed, dated, and ready. A couple of multipacks of 2-litre bottles in a cupboard will see a household through a short outage with no effort at all, and the small bottles are easy to hand round and ration. The downsides are cost per litre, packaging waste and the space many small bottles take up. Many households land on a mix: a case or two of bottled water for grab-and-go convenience, plus a jerry can or two for bulk. If you refill your own bottles or containers, use food-grade ones and treat them like stored water, not a permanent tank.

Food-grade, BPA and what the plastics mean

Only store drinking water in containers meant for food or drink. Reusing containers that held cleaning products, fuel or industrial liquids is a real health risk no matter how well you rinse them. Look for food-grade or a recycling code of 1 (PET), 2 (HDPE) or 4 (LDPE), and for BPA-free if that matters to you. Avoid clear containers left in daylight, which encourages algae, and keep water away from petrol, paint and pesticides because plastic can slowly take up strong odours and vapours. A proper water container is cheap; improvising with the wrong plastic is a false economy.

Where to keep it, and how long it lasts

Store water somewhere cool, dark and out of the way of chemicals — a cupboard, under a bed, a garage or a utility room. Off a concrete floor is a small nicety, on a board or shelf, though it matters less than keeping it sealed and out of sunlight. Commercially bottled water carries a best-before date but is safe well beyond it if the seal is intact; taste can flatten over time but it won't hurt you. Water you've stored yourself in clean food-grade containers is best rotated every six to twelve months — an easy job to peg to the clock change so you don't forget. Label everything with the date you filled or bought it.

Storage on its own isn't the whole answer

Stored water covers a short outage cleanly, but a longer one, or a contamination event, is where treatment matters. A water filter or a stock of purification tablets lets you make questionable water safe to drink, which stretches a small store a very long way and means you're not beaten the moment the bottles run out. During a boil-water notice, boiling is the gold standard for anything you'll drink or cook with. Think of it as layers: a modest store for the first day or two, and a filter or tablets behind it for anything longer. See our water filter buying guide and our guide to storing water for emergencies for how these fit together.

A sensible plan for most UK homes

For most households the practical setup is one or two rigid, food-grade jerry cans (10 to 25 litres, blue, with a working tap) as the core store, plus a couple of multipacks of bottled water for easy rationing and grab-and-go. Add a collapsible carrier for fetching and topping up during a longer outage, and keep a filter or a tub of purification tablets as your fallback for anything beyond a few days or during a boil-water notice. Store it cool and dark, label it, and rotate self-filled containers at the clock change. That's a modest, cheap kit that quietly covers the water problems a UK home is actually likely to face.