We don't boondock but we do stay at cg's w/o hookups that have water spigots scattered along the access road.
For fresh water I have a 6-gallon plastic jug to fill the tank by lifting and pouring. I also have a 15-gallon plastic barrel in the truck bed. I fill them both and the barrel gravity feeds into the FW tank fill neck via a fresh water hose.
For gray water -
I have a sewer cap that has a garden hose nipple on it. First pass was a couple of 5-gallon pails with pour spout lids that I would fill by gravity and haul to the dump station.
Second pass was a surplus 30-gallon plastic drum mounted in the truck bed. It gets filled w/ gray water via a HF 12V marine pump and recycled garden hose. It gets emptied at the dump station by a short piece of hose.
3rd pass (in process) will have a macerator pump to empty the black and gray tank into the 30-gallon drum. The drum is getting fitted with a 1-1/2" RV-style dump valve and a 1-1/2" cam-lock quick disconnect on the dump hose.
