When I was there in September 08 they did not have any special drink/refill deals, except for plain coffee refills on Main Street...I did hear they are going to be selling (or are selling now) larger sized sodas if that helps.....
They have souvenir mugs and cups that you *could* re-use if you want to, but you'll pay full price and they'll look at ya funny and make sure you know you'll be paying full price.
But no "refillable" mugs like people think of over at WDW.
Those come in so handy at other amusement parks. Last year at Six Flags they had an awsome deal, for $20 you got 3 mugs, and armbands for FREE refills all day, after that, you could bring them back for $1 refills.
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