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I second the vote for a water catchment system. Check out earthships. In the deserts of Arizona they are able to gather enough water just from the roof. It is like hypermiling for a house. The water is first used for washing then is held in a grey water tank for secondary usage in toilets and garden. Not everything earthships do is genius, but the idea of catching rainwater could save you a lot of trips to get water. Heck, done right you might just have to haul a few 5 gallon tanks for drinking water.
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