I rarely go completely off grid as I travel, but I do utilize the campervan’s water tank to carry up to 11 gallons of potable water for cooking, washing, and drinking. To refill the tank I typically look for free water sources, such as a friend’s house, city park, RV dump station, or any available spigot that I don’t think will get me arrested if I borrow it for a few minutes.
Many folks would prefer to have filtered water to drink, but tap water never seems to bother me. Besides, any chance I get to drink directly from a mountain spring I do, so imbibing less than stellar water while driving my van isn’t that big of a deal.
Below is a quick video I made in Page, Arizona when I refilled my water tank at a city RV dump station.
A good resource for finding water: iOverlander