Sounds like a total pain in the ….. to filter however many gallons a Host Everest holds every time you fill up.
If one is intent on being protected from the evils of “non city” water, lol and not willing or able to buy bottled water for drinking ( the cooking one always cracks me up, as boiling water sterilizes it, which generally happens with any cooking scenario with water), then the economical and easy solution is filter/purify what comes out of the tap for drinking.
And if the water you’re pumping in smells/looks/tastes “bad” move on to another source or only add as much as you absolutely need for the terlet and bathing until you find a better source.
Haven’t camped in remote areas of the eastern and SE portions of the country, but never gave much thought to “water” in the western half of the country.
And if you do have a valid concern with the location and water, go somewhere else to get some water.
Also, same boat ballast bags and ballast pump make the ideal water storage/transport/transfer setup, IMo. Especially for large qtys. I’ve easily packed an extra 100gal on the back seat floor of the truck, with the kids in the back seat, to remote camping areas where we wanted to live the luxury life of having lots of water and the ease of not pulling water out of a river.
2016 Ram 2500, MotorOps.ca EFIlive tuned, 5” turbo back, 6" lift on 37s
2017 Heartland Torque T29 - Sold.
Couple of Arctic Fox TCs - Sold