phat
"I've kept a pee bottle with me at night since my 20's. - and just dump it out in the morning and rinse it out. A 750 ml Gatorade bottle or something like that."
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First time my buddy used a gaiter aid bottle it froze. I told him he should have poured it out the door while it was hot. He thought that was disgusting so instead he had to actually put it in a pan of hot water for a long time to melt it sufficiently to pour it out so it could be reused. The ideal situation is a floor-less pyramid tent, no need to even get out of your sleeping bag.
Jim