To do the daily wash-up I need approx. 1 liter to 1 1/2. Hot water, from the little electric
kettle. That wiil do, the rest I do with salt water
I do not use a watertank but instead a large (polyethylene) container. Electricity is supplied by a 6,5 KWh genny, 3x 230 and 1 x 420 V. Dishwashing requires daily the same amount. Slowly I become pretty independent and I focus on that issue.
There is waterless soap too.