D I can remember climbing in the Tetons a few years ago and filing our water bottles straight out of the ground. But then again, we were at ten thousand feet…way out of range of beaver pee.
Not a good attitude to take. I’ve seen Elk, Deer, Marmot, Pika, Trout, Birds and Humans all well above the treeline (13,000’+) They all have to pee and poop somewhere and that can get into the water you’re drinking.
Lately I have been forgetting to carry water and pay for it. I feel like crud and am exhausted walking a few miles out after a long day of walking and fishing. I have a few camel back bladders that I need to put into my bags/vest. Otherwise I sometimes carry my awesome Guyot Designs waterbottle. It’s stainless, durrable as hell, and doesn’t get that funky nalgene or camelback taste.
I have a MSR waterworks filter that fits nalgene bottles, but I’m concerned with contamination from mines, fertilizers/trash from marijuana growers, or whatever other pollutants there could be here in CA’s waters. In Colorado I used it all the time for getting water while camping or fishing.