Battery-powered NOAA radio with extra batteries.  A blanket and/or sleeping bags

First aid kit and manual

Flashlight with extra batteries

Road flare or electronic signaling device for identification and/or help

Fire extinguisher (5lb., A-B-C Type)

Battery booster cables

Tire repair kit and pump

Compass, road map and knife

Bottled water and non-perishable, high-energy foods such as peanut butter and granola bars

Extra clothing to keep dry

Heavy sack of sand or cat litter (for tire traction) and a tow rope

Windshield scraper and brush

Should you find yourself stranded or stuck in your vehicle stay calm.
Take these actions until help arrives:

Stay with your vehicle! Do not try to walk to safety as you can become quickly disoriented in bitter wind and  cold and run the risk of developing hypothermia and/or frostbite.

Tie a brightly colored cloth, preferable red, to your antenna so rescuers can easily see you.

Run the engine and heater for about 10 minutes every hour.  Make sure the exhaust pipe is not blocked by snow or debris.

Leave the overhead light on inside the vehicle when the engine is running so you can be seen.

While sitting, move your arms and legs continuously to keep your blood circulating and to stay warm.

Keep one window away from the blowing air open to let fresh air in and reduce the risk of carbon monoxide poisoning.

Other important actions to take:

Winterize your vehicle before taking it on the road by taking it to a trusted mechanic.  Several things can be checked such as the tire tread, radiator and fluids to make it operate better under winter storm conditions.

Make sure to keep your gas tank near full to avoid ice in the tank and fuel lines.