I think i recall a recent story that involved a dry ice drink, the person actually swallowed the dry ice. so give every one involved clear instructions. as i understand it there should be a separate ice container within the mug so the dry ice cannot come into contact with the drinker.
Don't worry. We're a professional theatre and have been running this gag for about 7 weeks now, and it was rehearsed thoroughly with clear instruction before tech began. She doesn't even tip the mug (really it's more of a giant ceramic beer stein) she just pantomimes taking a drink while other actors on stage make slurping noises. In addition there is a physical barrier in the bottom of the stein to keep the dry ice in the bottom.
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