Our well water is hard so we have a water softener. My wife doesn’t like to use that water for cooking or drinking because of the salt so we buy gallon jugs in cases of 6. I save all of the empties for possible future use. I keep a lot of bottled water stored and have a number of 7 gallon camp water containers that I’d fill if it appears that SHTF is starting and a Water BOB too for the bathtub, but I figure I’d also fill those many empties too so as to better allow us to just hole up inside the house for a period. Post-SHTF it would also allow for a lot of water to be stored inside before winter sets in so as to reduce how many trips through the snow are needed filling jugs. Alternatively I could put them outside to freeze and then use them in an ice house for keeping food cool in the summer.