I am replacing my 2005 Trailmanor 2720 with a FR Solera. We have boondocked with 5 adults since 2008. It is my experience that we consume water at the rate of 5 gallons per person per day. This includes:
1. Navy shower every other day
2. Sponge bath and shampoo hair in between days.
3. All cooking water, including coffee
4. washing dishes, pots, pans (we do not use paper plates)
For a 4 day weekend I carry 40 gallons on board plus another 38 gallons in containers. I always have some water left at the end.
My wife and I, our daughter (32) and our son (29) have all done some multiple day backpacking over the years. We know how to conserve water. Our daughter-in-law is accustomed to camping, but not backpacking. She is learning how to conserve water.
If you are using substantially more than 5 gallons per person per day then instead of carrying more water, practice using less of it.
Wayne in Coarsegold near Yosemite
2013 Forest River Solera 24R
2014 Jeep Wrangler Rubicon
ATV trailer for the following toys
2008 Yamaha WR250R,2009 Honda CRF150F
2008 Polaris Scrambler 500