Where has the Potable Water gone in the NF Campgrounds

If the campgrounds have water which is accessible but not potable, you might want to consider a tedious but effective alternative:
water filters like backpackers use

These filters come in many sizes from individual to group use. When choosing a filter, pay particular attention to how it is cleaned - replace a cartridge or just clean and reuse? You could put non-potable water into your tank for toilet and such and filter other water into bottles for drinking and cooking. Drain and sanitize your tank after the trip.