We camp alot OFF-ROAD in the NATL FOREST areas around here. Just about all of them have a primitive rest room with fresh water source at or near the entrance.
When we start running low on water in our fresh water tank I will go back up the trail and bring back 10 gallons or at a time to re-fill the fresh water tank...
Being fresh ground bean coffee lovers we always carry enough bottled water of our favorite taste brand of water just for making coffee... This ensures we get the same favorite taste making fresh ground bean coffee... We use this water for cooking as well...
The fresh water tank is mostly just for washing dishes and taking stand up showers etc in our OFF-ROAD POPUP trailer...

Roy Ken