My advice is to not only plan for survival, but plan for comfort, don’t carry a blanket and a candle knowing that might or might not help you barely survive, instead carry what you need to sleep comfortably through the night and even after expending all of your body heat and energy while working on your car, or digging yourself out of snow or whatever the situation.
Like Cicero posted, have a set of winter clothes and boots so that if you need to walk out, you can, and tennis shoes and blue jeans, and wet socks won’t cut it.
“..and tennis shoes and blue jeans, and wet socks won’t cut it.”
My son will hop in the car in rainy, 50 degree weather with tennis shoes (sometimes flip-flops), shorts and a t-shirt. “Daaaadddd - I’m just going to the gym/ Tommy’s house, etc.”
I got him a pack and threw some decent clothes, boots, old rain gear, etc. in it. “So - if you get a flat and have to fix it, or have to walk a bit, you’re not doing it in shorts and a t-shirt.”