So we are playing a Serenity game, and after the adventure our DM rewards us with a highly rare and expensive water generator! He explains that it works by taking oxygen and hydrogen from the air and combing them to form water. And now we will have this in our ship. I stepped away from the table holding my head and saying "must not do science". But on the way home I wanted to find a way to fix this. At first I was thinking "wormhole to the elemental plane of water". But that is a bit unsatisfying and doesn't really sound like the Firefly universe. Is there a sensible way for this to work? How much energy would it take for this box to take carbon or some other reasonably available element and turn it into hydrogen? Presumably it would have a little box for the waste neutrons to go until you dumped them out of the ship. Thoughts?