another update:
put milk jug w/ mouse inside of a big box. put it on the drivers side floor. and put a light (clipped on steering wheel) facing directly inside the box(open top).
its one of those lights you can hang outside or even like a worklight, had a big metal shade, well we put that pointing directly inside the box and much of the light is inside the box, so hopefully the snake will come to the heat and go for the mouse.
i was going to do the heating bag but our heating bag is old and when u press the button for the heat, it gets hotter and hotter and never stops (according to my parents)
lets hope this works!