What you’ll find in these guides

Capacity planning, container comparisons, and filtration explainers that define their terms. We cover what micron ratings mean, where NSF/ANSI standards apply, and when boiling beats every gadget you can buy. For treatment procedures in an emergency, we point to EPA and CDC guidance rather than paraphrasing it, because the details matter and they update it.

The numbers that matter

• One gallon per person per day. Two weeks for a family of four is about 56 gallons. Add pets and any medical needs.
• Micron rating. Most bacteria are stopped around 0.2 microns; viruses are far smaller, which is why a filter is not automatically a purifier.
• Cartridge life. Rated gallons per element is the number that decides real cost — divide the price by it.
• Six months. A practical rotation interval for stored municipal tap water kept cool and dark.

Where to start

Store two weeks of water in containers you can physically move. Add one gravity filter for the household and a squeeze or straw filter for each bag and vehicle. Keep tablets as a lightweight backup. That sequence solves the problem for the overwhelming majority of households, at a cost most people find surprisingly low.
Current prices on barrels, filters, and cartridges are on our water deals page.

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These guides are general information. Follow manufacturer instructions and local codes for any product you buy. Some links earn Prepping Bargains a commission at no extra cost to you — it never affects what we recommend.