Have typically used about 10 gallons water per person per day, with 8 ppl on board, 2 or 3 of us salt water bath/fresh rinse, 3 or 4 of the ladies showering on board. We are conservative with use, but don't do without either. Unless you are wasting water 10 gal p/day p/person should not be an issue. Top off at Leverick to get you through 2 days at Anegada, then in CGB before you head for JVD, Norman Isl. where water will not be available.