Jason, Rumor has it that you are a big ole boy. Big ole boys need lots of water, take about 3 bottles of water, they are about 10 - 12 cents for the Walmart brand; I picked up a case at CVS on sale <$3. Freeze a couple and put them where they will thaw and stay cool; keep one where you can drive out of it. When float tubing on the Hooch, I have a piece of cord and a snap on it so the bottom of the bottle drags in the river; when warm water fishing I use a red neck thermos, two Koozies over a bottle of water, insulates the bottle and keeps it cool. I will check with my hiking friend and see what he does, I suspect a filter, he is very weight conscious when he is trying to complete the AT hike.