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Also Remember if SHTF is that bad you are having use a bucket, its probably safe to assume that you will be on rationed/starvation level food consumption and you and your family will not be pooping too much if anything at all.
When I do heavy work like building a block foundation for a home I consume 3000 calories + per day and the quantity of waste I deposit drops significantly because my body is consuming all food intake at an extremely efficient level.