Emergency water: how much to store, how to keep it, how to treat it | Preper

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How much water to store The common recommendation is 4 liters (about 1 gallon) per person per day. How to calculate your household's supply, which containers to use, where to keep them and how long water lasts.
Emergency water purification Four ways to make contaminated tap water, well water or rainwater safe. What each method removes and what it doesn't, with exact amounts.

Gear worth having

Equipment Water filters: what to choose Filter jug, under-sink filter, reverse osmosis, portable or gravity filter. What each removes, what it costs to maintain and which make sense in a crisis.