My time honored method. However, all I will tell you is that I am fairly sure that IF the bottle breaks only MY stuff will be ruined.
1. Wrap bottle in bubble wrap.
2. Put wrapped bottle in big zip lock, seal tightly
3. Put this bundle in another zip lock, seal tightly
4. Wrap the entire mess in a dry cleaning bag.
5. Wrap the entire mess in a towel or soft piece of clothing
6. Put this bundle in the CENTER of a suitcase. Top bottom and sides surrounding bundle must be clothes. No shoes or hard objects. There must be clothing ALL around the bundle. If it's on the top or the bottom chances are a baggage hanlder will drop a steamer trunk on it and bust it.
7. Put in suitecase. (I perfer one that has some rain resistance quality. Will trap liquid IN as well as OUT)
8. Cross your fingers.If it breaks there's not going to be a way to get it out without getting wine all over you stuff LOL!
Now as you may have noticed, this method and the method
DVC Grammy suggest take up well over half an average size suitcase. So unless you pack light you are now checking an extra piece of luggage.. Cost $25 or so. They sell LOTS of wine at Epcot. I don't transport ANYTHING to Disney. I only do this for wines I find in Europe that aren't imported here.