Lol, I was hearing a 90's song before you posted this, specifically this one:
Once I tried to make a fog collector with black garbage bag plastic but failed miserably :(, interesting reading.
At least I made a desalinator by boiling on another occasion.
Haha. Yes, a black plastic bag may not be quite the right tool, but worth a try. Desalinators are another helpful technology for coastal communities.
By the way all this post remembered me the projects that China is carrying out to turn its deserts into cultivable soil.
You can check here.