I can tell you that my daughter got a milkshake for her beverage on the DP at SciFi back in February. Not sure if we were lucky or it was the norm... but you can at least ask when you get there.
At Sci-Fi two weeks ago we were told adults could use the milkshake as either their drink or dessert under the DDP. Kids could not use as their drink, but could use the milkshake as their dessert.
Don't know about the other places, but we got the milkshake as our drink at The Wave, and yes they also brought full glass of water (we also got dessert...the milkshake was treated same as a soda, coffee or tea. Well, don't know if they would have refilled it, but it was huge anyway...we didn't quite finish the first one.)
At WCC 2 weeks ago we were able to get shakes for our drinks. Our waitress also let us get softdrinks and dessert. She was the best waitress too so much fun!
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