Water tanks are fairly expensive unless you are talking about an IBC tote or similar to just set on the ground. If you bought larger tanks and assuming it is legal, you could possibly create a water harvesting system and forego a well. Similarly, you could build a solar system to be used as either your primary power system or as a backup.
I’d talk to a pump out service to see what that will cost and a tank compared to getting a septic system installed. Random chemicals etc aren’t very good for a septic system also water proportion is important, so maybe a septic system is not practical assuming you would use typical RV chemicals.
I would have considered a lot more property when I bought mine if I had known how easy it really is to be offgrid.
