“When you are a grown up...you look out for yourself.”
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I’m in MA and am alone and could have gone about 2-3 weeks with what I stashed. We were lucky,though.
The backed up plumbing thing would be awful.
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If you are in a house and the sewer may back up, find the sewer connection outside your house and turn it off. If you are a prepper, you know how to get rid of human waste. If you are not a prepper and don't know about ways to deal with human waste, find out.