I carry two 5-gallon jugs to which I had added a brass threaded water spigot to each of their caps. The "kit" includes, as well, a 2-1/2 foot length of clear plastic tubing with a brass female hose fitting, a "water-thief" and a 4-foot light-weight step ladder.
Anytime I come upon a water supply, I can fill a 5-gallon jug using the short clear plastic hose. When I get back to my AS, I set up the ladder beside the fresh water tank fill and hoist the 5-gallon water jug onto the flip-down tray which is meant to hold a of paint, attach the clear hose to the spigot, slip the end of the hose into the water fill and open the valve and let nature do the rest.
I also have the QC ADC water filter mounted under the kitchen counter with its own spigot for filtered water - that's the water we use for drinking & cooking.
1987 Excella 32-foot
1999 Dodge Ram 2500HD Diesel