You are correct. Alot of focus is on food and hunting and self defence, but without potable water your done in a rapid amount of time.
You have actually mentined the most obvious methods the solar still
Really easy to make if you have some plastic and its summy. While you can make them out of any container, another method seldom mentined (taught to me
as a boy scout by a bone a fied Navajo) is to find adry river bed or wash, and dig down and then cover with plastic and the moisture in the ground
will evaporate out. If you have standing water you can be even more efficent. You ave to set up alot of them to get buy.


