I’d like to think that in general, we could live without.. just about anything. We’d find a work around. We could hand wash in the tub and use a clothesline. We could use a gas grill and microwave if the stove quit. Vice versa. We’re able to build fires, have a whole forest of trees we could use, etc.
I think overall? A furnace would be the worst to lose. Mostly because of the issues we’d have to deal with in the house.
Read about our trials without power last year when Casey was a newborn in cloth diapers here: P*wer *utage!