Food, water, blankets/warm clothing, and a first aid kit are what you want this time of year. 6 years ago I was caught in a gnarly mid-atlantic snow storm while making a poorly-timed solo trip from SC to New England (22 hours straight behind the wheel) and the experience taught me a few things. 1) Make sure your vehicle is up to snuff before you go anywhere. (Fresh, high-quality tires are what saved my butt that time.) 2) Have the aforementioned basics to survive for a couple of days with no assistance. If you need them you have them. Before that point see the next line item. 3) Having an emergency kit with the basics, set your face to fear no evil. Unexpected things happen. If they do, so what? You're prepared. Don't panic. Assess the situation, trust yourself to decide, and move on. Panicky decision making is more likely to put you in harm's way than anything else.