You rotate it every ~6 months: * https://www.cdc.gov/water-emergency/about/how-to-create-and-store-an-emergency-water-supply.html https://www.cdc.gov/water-eme

You rotate it every ~6 months: * https://www.cdc.gov/water-emergency/about/how-to-create-and-store-an-emergency-water-supply.html https://www.cdc.gov/water-emergency/about/how-to-create-and-... The old stuff can be used to water house plants or your garden. If you have advanced warning of an event (e.g., hurricane), you can also fill up a large reserve 'just in time': * https://thewirecutter.com/reviews/waterbob-bathtub-liner-review/ https://thewirecutter.com/reviews/waterbob-bathtub-liner-rev...