I've been known to do special ops gray water reduction myself at times.
This is my first WD set up. Now I am spoiled on it. I take dirty clothes with me. I know it's crazy. U get a WD and u will burn through your fresh water if u need to do a load or 2 off the grid.
My fuel tanks are 75g's. And it blows as thirsty as mine is. Heck I've got 134gal capacity in my 1 ton dually. That and a 600hp motor would be the only wish list items I would change on mine. But those are wish list for real. It does everything I need it to do and then some.