Ah yes, rain. That would make things easier. Although not as consistent supply.
But, I'm gonna have to disagree with you on the amount of water available in the air. Here is a page that goes into great detail about how much water is in the atmosphere.
-"On average, there is about the equivalent of 30 mm [1.2 inches] of rain in the form of vapor available to fall over any point of Earth's surface," -"That's around 55 pounds [25 kilograms] of water over every square yard, most of which is in the form of vapor,"
Also, anybody that has ran a small dehumidifier in their basement will tell you how fast you fill it up. Easily 10-25 gallons a day, depending.
I just realized I need a dehumidifier that will run on DC current.
10-25 gallons a day? If there was that much water in the air in your basement, it'd have its own atmosphere. I have one in my basement and it usually gets no more than a cup per week. And yeah, there's a lot of water in the Earth's atmosphere, but humanity is nowhere near the point of being able to build a dehumidifier capable of condensating at such a gargantuan scale. Even if you were to build one the size of the Burj Kalifa it'd only produce enough water for a small village, and only on a humid day. It's not an issue of supply. It's an issue of scale.
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