I'd cut me a hole and get a drain pipe into the ground for a pissuer. Make sure you put a cap on it to stop stink in the shanty and put that hose about 3-4 feet into the ground. a coleman stove will heat that place for you and get a small tank, lets you have coffee, teas, soups and stews or eggs and such for an all day trip.I always mount my tanks on the out side and run the hose in.
But the best thing you can do for your kids imo, tear that thing down and teach them how tohunt in the woods first, let them earn that shanty first. Otherwise people have a tendency for lazy hunting or shooting. Yes, I have a great shanty about 18 feet off the ground w/all the dood dads but, I spend most my time on the move and let others use my shanty. But thats just me.......