I think if you get a specialty drink, there are no refills. For example, my mother likes Root Beer. In some restaurants (non-WDW) they only have it in a bottle and they don't refill that for free.
Lemonade also isn't always refilled for free. Be careful. I can't remember where we were (have to look back at the receipts), but dh was charge over $4 a glass at one restaurants -- and it was just your common variety of lemonade made from a mix!!!
We were pleasently suprised that at some restaurants, specialty refills, like juices, didnt get charged.
I htink though that was more of a server choice than protocol
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