In the Star Trek TOS Episode s2e21 "By Any Other Name", there are some scenes involving Montgomery Scott attempting to get an alien drunk. Part of the gag has him pulling out a bottle of Scotch Whisky from its hiding place. The bottle is something Scotty really wanted to save, and it's not just hidden, but hidden in a medieval knight's helm and freezing, with frost on it and steam/vapor coming off from it.
How did this come about in production? What was so special about this bottle? What was Scotty saving it for? Specifically how did the freezer part get thought up? Was this ever referenced again?