I would suggest getting 2 half-gallon growlers and bringing them with you when you go to get beer. They shouldn't have a problem with it since you're saving them from using a jug, and you get to drink half a gallon one night and the other half the next night. The Flatbranch brewery in Columbia, MO sold their beer in growlers when I lived there, and the beer definitely holds for a couple of days.
You can buy them here... http://morebeer.com/product.html?product_id=17106
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