What to Pack...
Jumper cables to restart engine
Cat litter or sand for tire traction on snow and ice
Shovel to scrape snow away from tires
Ice scraper to clear windshield
Warm clothes gloves, a hat, sturdy boots, warm jacket and even a change of clothes
Blankets to keep warm inside the vehicle
Flashlights and extra batteries for increased visibility
First aid kit also pack necessary medications incase you are stuck on the road
Food pack items containing protein such as nuts and energy bars, also canned fruit and a portable can opener are good additions
Water bring enough for each person in your car and any pets
AM/FM radio to listen to traffic reports and emergency messages
Also consider...
Bring a cell phone if you have one with a list of emergency numbers. Baby formula and diapers if you have a small child.