scrof

Then don't pack food, get some vitamins, you won't die. It's physically impossible I think not to poop if you eat anything at all and I wouldn't recommend forcing a constipation as it can cause you more harm than it's worth.

They should try advance through minefields as vast as an ocean and then criticize.

Canned tuna. It's very dry and almost all protein so most of it gets absorbed by the body and you'll be pooping neat little bricks.

Good thinking.