I'm willing to bet that since your car is "stalling" it is not the batter, and it is not the altenator.
The easiest thing, and this is something EVERYONE should do to all cars that spend most of their time outside at night (when it gets the coldest) is use the gasoline additives that DeltAlum mentioned. This is going to offer you even more protection than keeping your gas tank more than half full (I speak from experience having had a three-quarters ful tank not supply enough gas one time). The additive I use is called HEET, it only costs $1.09, and everytime I fill my tank I put a bottle in.
This will be the cheapest thing you can do to prevent winter starting problems.
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