I installed a new water filler and use the camco filler shown above on the hose, works great. I've never filled from a container, so I can't speak to that. I just fill up before I leave since I trust my water, and I have 40 gallons, so I've never ran out. Worst comes to worst, I have deck plates in the tanks for cleaning, so I could use them to fill if a container didn't work with the filler.