Four dollars for a 10.8 ft2 (1 m2) model of a new device that can provide daily clean drinking water for a family; also built using easily procured everyday materials

https://interestingengineering.com/4-dollar-desalination-system

"solar desalination device without a wick — a part that typically needs a lot of cleaning or even replacing due to a buildup of salts... comprised of several layers that float atop a container of saltwater... a little warm salt water remains behind after the process, which is then naturally drawn into the rest of the cool water below where it becomes diluted"

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