This seems weirdly inverted to my boy scouting experience (in San Diego). Our training put a huge emphasis on filtering our water before we drank it, it was con

This seems weirdly inverted to my boy scouting experience (in San Diego). Our training put a huge emphasis on filtering our water before we drank it, it was considered fool-hearty to drink water from a river or stream before filtering. Anything from garbage to a rotting deer carcass could be up stream.