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Just a guess, but probably silver:

http://en.wikipedia.org/wiki/Medical_uses_of_silver#Water_pu...

If they pasteurize or pressure cook the water with the player in it, I would be very impressed. That would work pretty well. Could also acidify the water aka lemonade. Doesn't take much citric acid to make water bath canning viable.

How do I know so much about canning food? I can stuff you simply cannot buy in retail stores, like brandied fruits and the like. Very tasty!

Add some chlorine to the water.

Maybe. I'm not sure they would need to, the player isn't going to have much in the way of nutrients on it.

You'd be surprised by just how little bacteria needs to grow.

Most bacteria are little.

Is that important?