I'm relatively new to this forum. And many of you might not know much about me. I'm a survivalist, and have been so for over 25 years. I started out tropical swamp environments, initially as a hog hunter. Just getting around in the wetlands for an extended period of time put you in some difficult situations. In 1997, I moved back home to the Appalachian Mtns, and I have been "training" in mountain survival, especially winter survival. I have taught people survival techniques in both online forums, and in person.
Now that winter is coming our way, I thought I'd address something very few people think about. Preparing for a winter emergency in your vehicle. Most folks leave home with the clothes on their backs, an ice scraper or brush, and that's about it. We never know what could occur, that could force you into a survival situation. You could be going to work at night and become stranded somehow. You could be out on a day trip in the backwoods. Regardless, the key to survival is preparation.
In my Jeep, I keep what I call a "bug out bag". Inside that bag is extra clothing, hygiene items, extra socks, poncho, etc. I have another bag there which contains knives, fire starters, GPS, extra batteries, flashlights, compass, small medical trauma kit, lighters, cyalume light sticks, para-cord, etc.
One of the biggest problems when you get stranded is food and water. You can go for a month without food, but you can barely survive 4 days without water. I keep a 5 gallon "Jerry" can of water in the Jeep, in addition to my several canteens. Make sure you wrap your water supplies so they don't freeze. A big can shaped icicle isn't going to do you a bit of good.
I try to keep freeze dried rations in water-tight bags. You can get many meals for about $5 each. Also, foods such as oatmeal, grits, or other hot cereals are good to take with you, easy to pack, and all you need is hot water to heat them up. Dried fruits, nuts, candy bars, etc, will provide you with extra energy which you will need, especially when the temps drop through the basement.
You will also need a good sleeping bag, wool blanket, plastic sheeting, and other shelter building materials. I personally pack a bivy tent just in case.
You will need tools. At minimum, a shovel and an axe. I would NEVER go into the field, or out in bad weather, without an axe. I also have a Gerber machete in my pack as well, and a Cold Steel heavy machete.
I like to carry at least a centerfire rifle, or shotgun with me, along with my personal sidearm. If you have a .22, bring that too, because they can keep you fed. Make sure you bring adequate amounts of ammunition. I bring LOTS of it, because......you never know.
You cannot count on a cell phone, especially in a remote area. If you are in an area where you can get a signal, all the better for you.
I could make an endless list of supplies you could pack and take with you. You'll have to use your imagination, and pack accordingly.
The amount of "comfort" or "distress" you end up with, will be up to you. It's all a matter of how well you prepare. To go out unprepared could make you a statistic. Don't go that route. It doesn't take long to assemble the things you will need to make a good go of survival. If you neglect to do so, you are going to suffer.........trust me.
Hope this was helpful to you.