Great. These in public places without infrastructure, and let's start putting more vacuum based systems in homes and businesses.

Vacuum based systems?

Slurrrppp. Think airplane commode.

There are probably better articles on this, but a brief summary :

https://evac.com/article/benefits-of-vacuum-technology-in-water-scarcity-areas/

What did you think crevice tools were for?

The problem isn't that there are too many people, or too little water.

The problem is billionaires are wasting all of our resources doing their capitalism.

The planet is 2/3s water, but it doesn't make "economic sense" to desalinate it with renewable power, and pipe it where needed. Maybe if we stopped measuring the value of a thing ONLY in dollars, we'd all have a better time.

This one is designed for post disaster use though, but you’re not wrong.

(Gonna also note that desalination has costs and downsides. Energy is only recently free and still has externalities, materials are still scarce and have to be prioritized, and it really isn't that much fun hauling water, cleaning filters, or building pipes. I think in almost all arrangements of how we spend humanities total effort, we wont be piping that much pure water into the middle of the Sahara.)