Running out of drinking water is stupid in today’s technological environment.
https://www.google.com/search?safe=off&rlz=1C1GGRV_enUS765US765&q=desalination
Now the left wingers around the world can set up water rationing. and taxing water with rates that increase with usage.
It’s also stupid that many areas literally prohibit collecting rainwater.
I’m inclined toward encouraging all homes to have rooftop solar + rainwater collection, making them at least viable in times of scarcity (blackouts, droughts, etc). Nothing is taken for granted like electricity + running water, and nothing stops society faster than either of those getting turned off.