I voted onboard holding tank, but I have to clarify that my straight drinking water goes through my britta first. I make ice with, cook with, wash dishes, take a shower with, brush teeth with the holding tank water so I cant how you can avoid a bacteria/germ problem if you have one by avoiding only drinking the water...you are exposed in SO many other ways.
That being said, during the summer, we are out almost every other weekend to every third weekend. When it is at home, I leave some water in the fresh tank, make sure the lines have water in them and then turn off the pump. With solid water in the lines, I dont really have to worry about germs forming in the lines. Then with the tank, I fully dump it before we leave and refill it with new water every trip. This way I try to remove most of the "stale" water from the system. Then turn on the pump or go to city fixtures after I am done filling at the house and just flush the lines real quick before we go. I have never had "bad" water using this method.
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2016 Seneca 37FS
DW+7 kids+2 dogs=bunkhouse required
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