We don't have any concerns about any water. We bring about a gallon to make HOT coffee and that's it.
The National Forests have out-house and getting a site next to one of them is never a problem.
My Lady-Bug just had a potable water tank to start and that was broken when I got the trailer years ago but we get by with a portable tank. I even installed an electric pump for summer use but in the winter I find just carrying what you will need is enough and useing a wash pan for gray water and the park facilities works best.
It is amazing how cozy the little 13 footer can get with just the furnace
but this summer I do plan to insulate the floor.