The gift shop does carry milk. It's only the little school lunch size cartons, but I bought 2 every night and put them in our ice bucket with ice for our cereal in the morning.
I do believe they only sold whole milk though (no low-fat or non-fat).
They have a refrigerator case to the left of the cash register which did have sodas, juice and milk. As far as snacks, I didn't pay attention, because I never bought any. There may of been other things in the refrigerator case, but I wasn't paying attention.
Hope this helps!

,
Katie