It's always good to have backup utilities.
If we run out of oil, we have a fireplace and a woodpile. For water, we can melt snow or filter the spring. And, just in case, we have a two-door outhouse.
One door died years ago and has not been resurrected. The second door has a tendency to not stay shut. Porcupines gnaw the wood for the salt from human sweat.
And, apparently, it makes a great home for screech owls. Pardon the quality of the photo: I was using a cellphone through a car window somewhat coated in basset hound drool. (But isn't that how it always works?)