Just completed our first trip with our new travel trailer

You will find it is impossible to carry enough water to make up for wasteful use. When I camp, I get by on 3 gallons per day for drinking, washing dishes and taking a shower. It is just a matter of technique. You don't run the water needlessly. A shower is a good example. It takes maybe a half quart to get the hot water to the shower head, then I wet down and soap up with little or no additional water. A quick rinse completes the shower with a total of 1 gallon of water or less.