Dont listen to Rednek.. his name says it all (kidding). I wouldnt take the chance without a filter.. you could end up with "beaver fever" (no, this isnt something you get from reading smut mags, its Giardia). Met someone on the trail in the Adirondacks with it. He couldnt stop puking and crapping, but the worst part he said was the cramping. I've never had a problem in the pines with my PUR brand filtration system so Im guessing whatever you have will work fine. When you doing the hike?being that you have done some hikes there is the water too acidy to use my water filter??