I use the fresh water tank for everything. I am on well water.
All water is passed through one of those blue in line filters right as it goes into the tank.
Spring time I sanitize the system. I empty the tank and refill two times to get rid of the chlorine smell. The third filling is to the brim and normally tastes good.
When not in use the tank is full to the brim all the time. No air equals minimum chance of things growing. If the camper has set for a month. I drain and fill.
I let water run out of the hose for five or so minutes before I do any filling. Then I add the filter and run water for two more minutes through the filter.
If hot water starts to smell. I drain it squirt some bleach into it. Fill it and let it sit for a day. Drain it and fill it and live with a faint bleach smell till it is gone.
Oh, The dog always gets first crack at the new campground water. If she will not drink it after a days drive. Nor will I.