if you have a day or two in one spot, it's easy enough to purify surface water with a 50-gallon food-grade drum for settling and a few capfuls of bleach. they o

if you have a day or two in one spot, it's easy enough to purify surface water with a 50-gallon food-grade drum for settling and a few capfuls of bleach. they operate in pretty remote wilderness and may even be upstream of the cocaine labs where there won't be too much contamination. the process can be accelerated with a simple gravel and sand filter, and if you're thirsty enough nobody really minds crunchy water