When I drive, I wear clothes that are appropriate to the weather, even though I am inside the car. Not the kind of clothes you could spend a day in, but ok for a couple of miles walk. In the wintertime, say 40F or cooler, I like to wear gloves anyway, and always have a hat of some kind with me.
In the car I keep a hi-vis vest that fits on top of even winter clothes, a small flashlight that is charged in the cigar lighter, first aid kit, a 12V compressor and a can of that fix-a-flat stuff. Some work gloves, and a seat cover. Tools and jack to change a wheel, but no spare wheel as the car did not come with one.
I admit I rarely drive anywhere where it would take hours to get help, so I only prepare lightly. Having water or soda with me in winter would not help, nor would candy bars as they would be frozen solid from November to March
I used to have a small foldable shovel, but it broke the first time I used it, fortunately not an emergency, so I ditched it. My Saab can handle about 8 to 10 inches of light snow, one just has to know what he is doing, FWD is great, just tread carefully and when you feel you may be getting stuck, don’t slam on the gas, but stop, back up a few feet and try again SLOWLY. Of course I have winter tyres, they are mandatory here in the wintertime.
Edit: Almost forgot the most important ”tool”, a well-charged cell phone, kept warm in an inside pocket. Apple products tend to shut themself off when it gets cold
