Before a bigger battery or a clever gadget, make a simple plan for safe water. The important detail: different guidelines describe different uses.
How much should you store?
UK Be Ready recommends being ready for three days. Its water baseline is 3 litres per person per day for drinking, with extra needed for cooking and washing. For two people over three days, that is 18 litres for drinking alone.
These amounts are not interchangeable. Drinking, cooking, washing, and sanitation are different needs. Pets need their own water. Hot weather, pregnancy, illness, and some other circumstances can increase requirements.
Our home checklist multiplies the selected baseline by the number of people and days. It does not assess individual medical needs or automatically add pet water. The household reminders help you notice those separate requirements.
Keep storage simple and safe.
CDC describes unopened commercially bottled water as the safest, most reliable emergency source. Check the dates and storage instructions, and keep it cool and away from direct sunlight.
If you fill containers yourself, use suitable food-grade containers, follow the official cleaning guidance, label the storage date, and follow replacement guidance. Never reuse containers that previously held toxic chemicals. CDC advises replacing self-stored water every six months.
Choose sizes you can actually lift and pour. Several smaller containers may be more practical than one very large container, especially in a small home or for someone with limited mobility.
Recommended
Morrisons Yorkshire Vale water, 6 × 2L
Sealed bottles provide drinking water without needing to fill and sanitise empty containers first.
- Six 2-litre bottles
- 12 litres in the pack
Before buying
This is a retail pack, not a household allowance. The water alone weighs about 12kg. Use suitable home storage and manageable bottles rather than carrying the whole pack in a grab bag. Follow current labels and storage instructions; equivalent supermarket water is fine.
A filter is not a complete water plan.
Different products address different contaminants. A camping filter should not be assumed to remove every virus, dissolved chemical, fuel, or other hazard.
During a water incident, follow your water supplier’s and public health authority’s specific instructions. We do not reproduce improvised treatment recipes here: what is safe depends on the contamination and the product.
What about a grab bag?
Water is heavy. A bottle in a portable kit is a departure reserve, not proof that you have a full day’s supply. Plan the destination, transport, and access to safe refills. Carry more where practical and adapt to conditions.
For carrying safe water, an ordinary refillable bottle can help. Fill it with safe drinking water; an empty bottle is not a filter and does not replace your stored home supply.
Do not let a compact bag, a budget target, or a checked box hide a real water need. If the numbers don’t fit your circumstances, adjust the plan rather than pretending the need has gone away.
Go to the source.
Supporting sources, checked 25 October 2026. Our explanations and product examples are editorial choices, not hands-on tests or official product approvals. Equipment quantities are starting suggestions, not a safety guarantee.
GOV.UK · Be ReadyBe ready for emergenciesCDCHow to Create an Emergency Water SupplyHow we use sources