This is a very simple water heater that can be made in 5 minutes and can heat 140 degree water. Great for camping. Making tea, coffee or a small bath. It works very quickly for solar heating a small batch of hot water. I just painted a Starbucks Frappachino Bottle black, poked a hole in the cap and put it in a container that had red vines in it. Cover 1/2 of the back with aluminum foil and point towards the sun. Do not tighten the cap. It could explode if it got too hot. Take a small nail or an awl and poke a small hole in it for a vent.
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First test 140 with a meat thermometer. I put cold water in it and went to town, when I returned (about 2 hrs) it was up to 140. Not to bad for a free heater.
