ORIGINAL: 88N
if'n ya don't trust the water boil it for 30 min(rollin boil) then let it cool and drink it or you can throw a handful of coffee in it and that helps curb the bad taste of swamp water
Heck a half gallon pot of water with a rolling boil would boil away into steam in a half hour then you would be left with nothing to drink.
After living in a small midwest farm town they would always issue a water boil order after a good rain we would just boil the water to a rolling boil for 15 minutes or so and never had a problem.