You know, a good flask is much under rated
Just fill a good size, easy pour one with hot water and put it in the car every time you go out in Winter and it'll do everything from cuppa soup to hot chocolate or a pot noodle if needed (the instant potato ones aren't so fussy about 'boiling' hot water )
Keeps life simple; dried long term keep foods, add Rik's cake bars and energy drinks, and a pack of baby wipes and a kitchen towel roll and it'll all go in a carrier bag in the car no bother at all.
I've usually got a small stove set in the car in Winter but tbh I've never needed to use it, but the flask proves to be well worth remembering
cheers,
Toddy