I have water stored in 5 gallon containers (some of the blue Aquatainers and some inexpensive white ones purchased new). Most of the time I have about 40 gallons on hand. While this is enough for short term use I do plan to pick up at least a couple larger vessels when I can. The 55 gal ones would be convenient for filling but not very portable.
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“I'd rather have questions that cannot be answered than answers that can't be questioned.” —Richard Feynman