There's an article on MSNBC.com that gives you a recipe for how to make your own butterbeer. The article starts: "No need to travel to Hogsmeade (or to Universal Orlando) to get a taste of Harry Potter's butterbeer. We've created an easy version of the formerly fictional drink made famous by the young wizard."
It's a lovely, tasty recipe that looks like just about everything a diabetic should not have. I think we're going to try this when the weather turns cold.