Survival items we were told to have in a car in Alaska back in 1968.
Blankets
Sterno 2 cans
Matches
Hard candy.
Since that time I’ve always kept these items in the car in winter, plus I add a few other food items.
I also add a PLUMBER”S candle to the batch.
The blankets should have a sleeping bag to go inside of, and people who live in snow need to keep extra socks and some sweats to sleep in, in between getting in and out of the car (and getting wet), at the very least.
Without getting into all the big list for survival and all that, what you and I mentioned should be a minimum.
Start with the sleeping bag,the blankets are the extra.