How to make "pico-hydroelectric" power - doesn't require a lot of water and generates enough power for at least one household. I was thinking something like this in-line with your water inlet system since it is already under pressure.
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Bunkhouse: DIY small cabin retreat: 130 square feet plus a deck - sleeping loft, IKEA furnishings (like a table that folds against the wall when not in use), barn door that opens the inside to the outside.