I need to survive for 3 days without pooping, and eating as little as possible. I can pee, but not very often. It can't take up too much space. What food do I pack? -

Peanut butter and vitamins. High energy density, so you only have to eat a bit. But protein to sustain you. If you’re doing strenuous exercise, may want to bring some of those gels for running. I guess that’s basically a pb and j without bread.

but, why though?