Live in my sisters backyard in a bare bones room. So it's basically an /out/ experience. It's getting cold now (2'C) on some mornings/nights.

What are some ways to keep warm? Besides layering up. What are some gear to supplement my bed stuff to keep warm and undisturbed at night.

Also if I keep pissing in the same spot outside (along the fence or a plant, basically seeping into the dirt/ground/grass) will it stink up that area