This is a good reason why one should always carry emergency supplies, including emergency blankets, in one's car when traveling during the winter.
I am in the far north and in the Rockies, where such things are life and death all the time.
Every fall my truck gets a 3-day kit with everything I need to survive the winter with nothing, by hand.
It has certainly saved my life twice, and likely two more times.
You will thank yourself when it is 10 below and your truck is stone cold dead, and you are sitting in a Colorado lean-to shelter in 70 degree heat with a full belly. DEFINITELY the way to go... And of the four times I speak of, three of them I walked out on my own in four days or less - Because help ain't gonna show up for at least three.
Being able to build a camp, survive comfortably while you build a polk, and maybe snowshoes, and have enough to walk out on (at least three more times setting camp) is surely the only answer,
Not only the tools - but the knowledge on how to use them.
