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first thing you want to do is seal it from drafts, that is why I suggested plastic on the outside, but even duct tape over the crack would work, then you want to make as many tiny air pockets as you can, foam does this in a ridged sheet that you can cut to fit cardboard does this in thiner sheets that can be stacked together, bubble wrap, or reflectix has larger bubbles but works, fiber glass bats or blankets work as long as their isn't a draft.
if you plan to stay there next winter as well then you might invest $20 in foam and some nice looking fabric to make a custom size plug that you press in to place.
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