Whether you’re in a van or an RV you are going to run out of fresh water and fill up those holding tanks. Your options are stop at a campground or RV park that has the amenities you need and spend the night or make a brief stop for much less and be on your way to the wilderness to keep living the dream.
My wife and I didn’t realize their were FREE places to stop and get water for our van or we would have started using them much sooner. We came across our first free water spot at a rest area off I-70 in Fruita, CO.
Here’s a link to places to fill up and dump. Most are not free but some are.