the ideal conditons that makes a solar still work best, also will make the occupains even more dehydrated. I mean sitting/lying in a greenhouse-ish tent in a desert ?!?! Also it's a illusion that there is much water right under your feets in desert or other kind of places. And if there is a lot of water, you will be lying on wet ground directly. Which isn't good either. So i have ceriously doubt it's very practical...
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