Nice rescue and lucky snake.Most probably dont have a happy ending.
Until you get your heat mat and more suitable suplies , you can pick up a cheap maintenance lamp at home depot for like 5 bucks and a 40w red bulb at a pet store for some heat. You can use your room lighting for your day/night cycle for now. The big thing is getting your enclosure temps at least into the 80s til you get properly set up.
I would leve it alone for awhile and a fresh water bowl is a must.