Fulltiming across the USA.............on your own land?

If near a town I would consider hauling water in a tank behind the truck or on a trailer. Most municipalities have a portable load station. My half ton handles a 500 gallon tank on a trailer. That would probably lasts a few weeks in an rv. You can get potable approved tanks that are black in colour to prevent algae growth. Have a little transfer pump to fill the rv from the tank on the trailer as needed.