Smaller Holding Tanks...What to do when NO hookups??

With a 30 grey and 30 black you can last a bit. I can easily go 4 to 5 days with 3 people if i use the campground showers and conserve a bit. You could wash dishes in a seprate bin and use the water to put out your fire at night. I run out of freash before i fill the tanks, usally. Sometimes the kido leaves the taps open more then needed. The grey will fill up before the black. So i use the black tank for overflow,think pasta water, unfinished drinks, etc.