I can't see what's wrong with drinking water from the RV:
1: Pipes are pipes. PEX is rated for residential use.
2: The valves and faucets are the same.
3: A water pump is a water pump.
4: A FW tank is the same plastic for a 16 ounce water bottle versus 40 gallons.
5: A water heater is just a smaller version of the one at home.
Of course, one needs to sanitize the rig, but this is not too hard to do.
I guess I'm old then, although I do use bottled water for one main reason -- the bottles double as ice packs in the freezer when I switch the fridge off, but want to still keep stuff cold. I also use bottled water so I can hand those off to friends nearby.