Learn to take minimal navy showers, your shower head should have a on/off cross slide button on the shower head. You get the water set, get hair wet, off with the water via the button. It leaves the shower head dripping to remind you it is still on, done with hair, on with water, rinse, repeat with the rest of your body, scrub/soap down while the water is NOT running. Use liquid body wash in pump bottles, no waste, no mess, no soap residue like bar soap.
Use a dishpan, run water in it, wash everything, dump dishpan in bathroom sink or Toilet, the black tank needs all the liquid it can get to carry the poop out.
I have a round kitchen sink, so I bought a round plastic pan at the H Mart (Korean supermarket) and it stays in the sink. I run very little down the drain in that sink.
Use Dawn Platinum Erasing FOAM dish washing degt. Damp dish rag, pump some foam on it, scrub the dish, in the pan, rinse everything at once with fresh water in the pan.
Also as others noted, use paper/foam plates, prepacked cereal in tear off the lid containers, minimize your washing.
Charles
