To add to the confusion, I heard the plan was to offer some sort of character and/or sponsored bottle top (a straw you can screw over the top of the Coke bottle). That would let you buy discounted "refill" bottles at certain locations, probably the outdoor vending carts. It's not the same as mugs. The rumored thinking was that if you had a mug of Coke and wanted to go on a ride you would just toss out the Coke knowing you could get more later for free. With the bottle cap and the charge, you're more likely just to seal the bottle. Given the number of guests this would represent a significant cost savings.