I have a 40 gallon fresh water tank. We took 2 quick showers, a few toilet uses and a small dish washing and my tank was showing empty. What is the average dry camp water use? Seems to us, 40 gallons ...
The dishes might have a lot to do with it too. If you do dishes like you would at home, you'll use a lot of water. I take my friends for a girls weekend once a year and the first time we went we ripped through freshwater in the first 24 hours! And that was with only two navy showers, the other two used the CG bathroom. After refilling the tank I saw my helpful friend doing the dishes - running the water like she would at home - yep, that'll do it!