What to keep in your car for winter emergencies:

Get a 4 or 5 gal camping water container. Fill it except for a couple of inches at the top to allow expansion if it freezes. Change it about every 6 months to keep it fresh.

Get some of the 3600 calorie food bars from survival stores or online. They have a shelf life of 5 years. You need a minimum of 2 bars for 2 people. 3 would be better for 2 people. That would give you 1800 calories per day per person.

A bag of hard candy to suck on. Not sugar free.

6 12 hour chemical warmers to help keep you warm.

First aid kit. You can make your own, or buy one from many places.

Shovel, for moving snow.

2 emergency space blankets, and 2 emergency sleeping bags.

2 disposable lighters.

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