I love good news. This, this is good news. 
A good system that passively makes fresh water from seawater without power or exhaust or byproducts, and sitting in the sun drives it. Scalable from family to community, etc.

"Cheaper than tap water"

Rain is even cheaper than that, breaking rain is big mistake. Rainstorms that destroy nations, or just bridges and highways, or rains no longer bringing enough water ---

We have to build all the energy needed to end carbon fuels

https://scitechdaily.com/mits-new-desalination-system-produces-freshwater-that-is-cheaper-than-tap-water/