weight in moisture. there are emergency blankets and bags that you can purchase as well that are easily fold-able. also, you should have several pairs of gloves and winter hats in your vehicle to protect your hands and head and whoever else may be in your vehicle. in addition, having a poncho can be nice to keep you dry if its raining and you need to go outside.
have two cars parked close (but not touching) and facing one another.
with both cars' engines turned off, open their front hoods and locate the cars' batteries, which typically looks like a large black box with two posts and two cables.
clamp the red cable 