2 1/2 people (7 yr old daughter).
We intend to stay put during school down here where we are (great school district #10 in state of Texas). So it would be summering that we'd potentially do off grid living. An A/C, all depending, would be a must so we'd have a generator.
We backpack a fair amount so a bird bath is easily doable. We do drink a lot of water. I can be very conservationally minded, but the girls not so much. This goes for electricity as well. Hopefully that can be cured rather quickly and certainly.
This trailer holds 43 gals fresh, 38 gals grey/black, and has two 20 lb LPG tanks that I may swap out for 30's.