I'll make it simple.. If there is a disaster and access to clean potable water is scarce and someone is charging anything for water... They're a piece of shit.
How do you decide who gets the water, and who doesn't?
So are you suggesting that only people who can afford $100 for a bottle of water get to survive? Is that what you're getting at? Fuck the poor?
If something like water is scarce, it has to be used carefully and efficiently. A technology exists that optimizes efficient use of scarce resources. It's called a free market. On the other hand, an "authority" taking over the resource and metering it out ensures very different outcomes: black markets, elitism, cronyism, corruption, and use of violence to enforce the arrangement.
You haven't thought this through at all. If the water is scarce and you give it away you will just run out right away lol