A great friend of mine used to take a thermos of coffee and a sandwich into his treestand. When the coffee was done he had a urinal available.
One day he left it on the counter and his wife dumped it into the dishwater.
It was never allowed in the house after that.
Seriously - I got the story early one morning when we were heading out before dawn and I asked him why he took the coffee pot onto the back porch to fill his thermos.
Personally, I climb down, walk off a distance (still-hunting a couple hundred yards), pee, stump-shoot, have lunch, then go back to the stand.