Stop in for a cup of coffee

No but sure that's how it was done. I have slept on the ground in a tent in subzero weather and snow before. Nothing I'd want to do but sure like most things after awhile you get use to it...if that's possible.
Yep, pee in your canteen cup so you don’t have to go outside, rinse said cup out in morning and fill cup with breakfast, rinse and repeat!