1. More wool socks than you brought.
2. A cozier sweater than you brought.
3. Piles and piles and piles of firewood.
4. The foresight to recognize that you're going to wake up to snow, therefore you should leave the heaters on.
5. Toast. A ton of it. And warm beverages.
6. Many, many, many books.
7. The patience to sit by the fireplace and tend it. Alternatively, a partner who exhibits that patience, aka The Historian.
8. Fortitude. And blankets.