Contact me about anything you need explained, I learned this trick some where close to 50 years ago. Desert survival trick. You can make these easy, and with basic supplies any where. Making roofless huts or areas of holes with fences around to keep animals out of the area. While it does not make huge amounts of water in a hurry, you can produce gallons in a day with a simple series of these all working for free of solar sunlight energy.
If you live in a city, put them on your roof tops, safe from theft & in the sunlight.
This image is DOWNLOADABLE & prints to A4 size paper, or with tiny reducing to 8.5x 11 inch paper.