Candles! We have several hanging lanterns that hold votive candles and 50 candles to put in them, Also a makeshift outhouse with a tall tent enclosure a luggable loo and cedar bedding.
Second the out house/pit toilet/honey bucket idea. It's not like your going to hold it for three or more days if the water goes out.
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Hope for the best and prepare for the worst.
The object in life is not to be on the side of the majority, but to escape finding oneself in the ranks of the insane