5 days at Boy Scout camp. I was more worried about getting something from the nasty showers than I was from my own stink. We also were in a heavily chlorinated pool twice a day. If it came down to though I could go longer but no reason to do that while the lights are still on
I don't believe bleach goes bad. I have had a jug of bleach in my garage for years now that I use on mildew outside my house and it is still as potent as the day I bought it. Also if your completely desperate for water after you run out of any stored water, your waterheater has a nice store of...