>>450150Sawyer mini filter for questionable sources, if it was a spring or high altitude stream I just drank it and took my chances. Didn't get sick once in 6 1/2.
Most people brought a couple liters with them, I've never really drank that much water since I don't really get thirsty so I was fine with a liter.
There were a few stretches in Virginia that didn't have any water for 20 miles or so, and so I carried more water there.