This is a game-changer:
https://www.businessinsider.com/solar-powered-device-turns-salt-water-into-fresh-drinking-water-2019-7
$500,000 for a solar-powered plant to supply 25,000 people daily with almost 20,000 gallons of fresh water made from seawater. That's just a $20 per person one-time expense. Wait...but that's less than a gallon daily per person. Not enough for Americans, who use an average high of 100 gallons daily. So we would spend $2,500 per person for the same plant. But the plant price is supposed to drop to $100,000, so $500 per American. Not bad.
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