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Politics are not permitted. There's plenty of places to discuss that elsewhere, and a hot pepper forum is not the place. Thank you for respecting the community!
No idea where to find it cheap, but I made an awesome portable ice shack out of that stuff years ago (dumpster diving...lol). I could run a heater for like five minutes and fish in a t shirt for an hour or so in -20 temps before I had to turn the heater back on. It eventually disintegrated from the sun...
Evaporation probably cools the water quite a lot more than direct thermal transfer to the air.
I bet that any covering, no matter how thin, will work well enough. Just make sure the surface stays dry.
I worked for a swimming pool supply mail order company for a few years. Solar covers are a little pricey when considering what they appear to be, but do what they are claimed to do when properly fitted and used. They serve a function In both heated as well as non heated pools by not allowing heat to escape directly into the atmosphere and absorbing heat during sunny days and transferring it to the water. We sold them by the 1000s.
fwiw. ours lasted a very long time... like 20 years in the garage. it got used for like 2 years when they first built the pool... there after it sat in the garage baking at 100+f. when we tossed it, it was still in good condition.