Although we are in our mobile mansions, we still need to remember when off the grid to be conservative and deal with it. We can go about a week 5 to 7 days, maybe longer without any replenishing of water or dumping any tanks. We only have about 50 + or - of usable water. This is with a shower each a day, dishes, bathroom and the periodic washing. about 5 gallons a day for us, that is her and I. When we have company, grandkids etc., we may use a bit more. Just got to get used to it. Good Luck & Be Safe ! ! !