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I believe Astronauts recycle most (if not all?) of their water while in space (ISS?) ... and they are up there for months and months. Surely it's tried and tested as a result? They aren't dead yet.
I'd have no problem with it for the sake of saving the environment. If there was an abundance of water I'd prefer to drink the "new fresh" stuff rather than the "recycled fresh" stuff.
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