LL Bean has just started offering a no-battery LED flashlight.  Crank it up for an hour of light.

An interesting concept.

On showers-marine stores carry an item called a sun shower, which is essentially a black bag with a hose, a clamp, and a shower head.  You leave the bag in the sun, and in several hours it is warm enough to give you a quick sluice-off.  And they really work.

Dishes can be washed in salt water, and salt water soap is also sold in marine stores.  Likewise salt water shampoo, although I never liked the result.

Books on long distance ocean crusing are very helpful for articles on cooking and eating without grocery stores or refrigeration.  One interesting suggestion is growing your own bean sprouts from dry beans.

The portable refrigerator/freezer that works off your car or boat engine works, but consumes a fair amount of fuel.

The Origo catalytic alcohol stove is a daisy.  The fuel can be stored in your house, and the stove is not pressurized so you are not risking your house when you use it.  With 2 Origo's you are really cooking.