If you've ever gotten your car stuck in a blizzard or been lost on a wilderness drive in winter, you know that keeping that car warm is vital to your comfort and even survival. Using the heater means keeping the car on though, and that means consuming precious fuel. And what if the car breaks down? Watch this video for instructions on how to make a portable emergency heater for your car that will keep it between 60-70 degrees for about 24 hours burning only rubbing alcohol. It could save your life.