Don't schit upstream....
Tanner
Ran into this last year. Hiked two miles down to a dry camp a group of old timers set up every year. Friendly guys but they were adamant we drink their water. It was in a 15 gal jug and tasted horrible. They started acting dodgy when we told em we were gonna filter out of the creek. Idiots. Gotta go a long way up stream once you've seen that.