In many dry camping campgrounds where there are water spigots available but no water hookups at the campsites, the water spigots don’t have threads. We’ve found a water bandit makes it possible to thread our water hose onto the spigot so we can fill up with water easily.
In addition, a water pressure regulator keeps the water pressure down to a level inside the rig that prevents any unexpected damage or leaks. A quick release makes it easy to connect and disconnect the fresh water hose. Mark also keeps a Y valve in his water hose arsenal. This is handy if the rig is connected to city water and we want to fill pails with water for washing the truck, or if an RV dump station has only one water spigot and we want to fill our fresh water tanks and run the black water flush at the same time.
Lots of folks like to attach a water filter as well. We used various filters at first, but no longer use any, although we periodically add a cap full of bleach to the fresh water tank. When we got a new fresh water tank, we were surprised that there was no sludge of any kind inside the old tank, even after 7 years of use.