When I was there a few months ago I over heard a hilarious exchange about snack credits.
A lady wanted to use it for a coffee:
Worker: You can only use your snack credit for a beverage
Lady: I was under the impression coffee was a beverage
Worker: No, you can only use it for a beverage
Lady: Coffee is a beverage
Worker: No it isn't
They were still going back and forth when our food came and we walked away. This was at the Commissary at MGM. DH & I giggled over that they entire meal.
Topic? I have no idea if you can use it for hot chocolate!