We are going in late September. My husband and I are BIG coffee drinkers. We'd like to use our refillable mug to get coffee at the resort (Wilderness Lodge) before we head to the parks, but I really don't want to drag our mugs all over the park. Are there disposable coffee cups that we can pour the coffee into to take with us? Then we can rinse the mugs out and leave at guest services? I don't want to waste snack credits on Starbucks every day, and one cup of coffee in the room just won't cut it.