Fill or partly fill your water tank and don't worry about the weight.
I always travel with some water on board.
Carry your own hose, actually a couple hoses, so when you find water you don't have to depend on someone providing a hose. And, consider getting a Water Thief, you may find an unthreaded faucet.
Check at gas stations, state parks, truck stops and RV dealerships for water. Just ask, all they can say is no.
Stop at a police station or municipal office and ask if they know where you can get water.
It's out there and available, just ask.
Enjoy your travels.