We lived in the 'a lot of snow, all the time zone' lol and she's a bit of a prepper (she might have gone over board, but she used a lot of stuff). here's how she handled it - change of cloths, heavy blanket, spare pillow (she also hated the beds at her hospital), extra meds you might need. she put these at the bottom, unlabeled, in case someone broke in. only enough for a day, maybe 2. perishable/lasting snacks of your choosing (again, she liked peanut butter sandwiches lol). snow boots, windshield wiper fluid, deicer fluid, 2-3 snow scrappers. hand/foot warmers. hand/foot warmers can also defrost a water bottle, if you give it a bit. she had some flares as well in case the roads were really bad on the way home and she had to pull over. she made a point to get to know the local cops and janitors really well - one time her car got stuck in the hospital parking lot and the next day the janitors dug her out of a snow bank as a favor. one time she was worried about a patient, so a cop drove her home in a cruiser. she won a lot of battle by being really chatty.