Let me apologize ahead of time if this question is already out there. Being that the 'search' is so difficult to use, I could not find the answer to this question. Anyway here goes.... We want to purchase the refillable souvenir cups from the All-Star Movies Resort. First of all, I realize that it can only be used at that resort. That has been CLEARLY established. However, can anyone tell me what is allowed in the cup? Juices? Milk? Coffee? Is it only for soda? Thank you.