The only way this story makes sense is if it occurred in the south, where they have club Applebee's. Otherwise, I have a lot of questions about how this would even occur.
I didn't say it couldn't, just that it is improbable for myriad reasons. Not many beverage druggings occurring in well lit, highly staffed, low customer restaurants. Unless the drugger was in this person's group, it would be pretty unusual.