Things You'll Need:
- Wooden box of any size
- Drill
- Car battery warmer
- Food-saver container
- Hook and loop fastener
- Rock
- Screws (optional)
-
Step 1
Buy or build a wooden box, any size, but 14 inches by 14 inches is a reasonable size.
-
Step 2
Drill a hole big enough for the power cord of the car battery warmer to be threaded through toward the bottom of the box. Thread cord through the hole.
-
Step 3
Apply hook and loop tape to the bottom of the box and the bottom of the car battery warmer and attach. Turn top of box over so the bottom of the box is facing up.
-
Step 4
Place the food-saver container on top of the box. You can also choose to screw or attach this box with hook and loop fastener.
-
Step 5
Place rock in center of the food-saver container.
-
Step 6
Fill food container with 3 to 5 inches of water.
-
Step 7
Plug in the car battery warmer.













