If I can get my old ass out into the mountains again, any mountains, for more than a quart
* or two will suffice, I'm not sure what I will do about potable water these days. When I began contemplating a resumption of backpack hunting, I bought a MSR pump-type filtration system; but it seems overly bulky and heavy, and I did not pack it along on the couple trips I've made since the purchase. I simply reverted to my old practice of drinking untreated water from sources that "looked clean enough"

. I did not turn

or

, though I don't recommend such an incautious attitude.
For lack of getting out myself, I've been watching a lot of videos lately.
I'm thinking about getting something like the Sawyer Products SP129 system, though I'm not crazy about plastic bags even though they make sense for gravity transfer. One can hardly beat boiling to kill biological pathogens in wilderness settings. Iodine tablets are probably a smart thing to carry for little weight and space they occupy in the pack. However, neither iodine treatment, nor boiling are ideal for those who prefer to not delay satisfaction.
Before there were nearly as many people on the planet, and I had a better-functioning immune system, I did not fret about water sources. Of course, I have lived most of my life in oft-drenched western WA where I had literally drunk water flowing in ditches alongside old logging roads. In my defense, I was new to the PNW and young enough at the time that I was not aware of how heavily conifer reproduction plots--we generally just refer to them as "reprod" or "dog hair" once they grow to jungle density--are aerially sprayed with herbicides, fertilizer and pesticides.
* That's a tad** less than a liter for the youngsters.
** Archaic term for a small amount--likewise explained for the non-geriatric.