Science is important, even in the prepper community. I will give you the following samples:

1) well water. 2) fluoridated city water. 3) distilled water 4) spring water from some Nordic country. 5) room tempature water (thanks OP) 6) cold water.

I'll bet 99% of preppers have over $10,000 in guns, ammo and PMs. but less than 20% have a $0.99 bottle of concentrated lemon juice.