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Well if there was any gas that is generated then simply puncturing a hole in the top of the water bottle would solve that but I don't believe there would be unless you had urine for a yellow light which mixed with the bleach would create mustard gas and kill you
I don't think so that is most likely just a choice because thats what alot of sheds roofing in made of im sure you could use sheet steel
Don't quote me on it because I don't know for sure but I believe it's because the way the bleach mixes with the water is how it reflects so much light but I personally don't know too much about chemistry so you could try it but I don't know
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