I’ll go first.
Winner:
Breaking Bad, season 3 episode 10, “Fly”
Honorable mention:
Community, season 3 episode 10, “Cooperative Calligraphy”
PS: I’m having a hard time categorizing these as real bottle episodes since they don’t feel cheap or “fillery” at all, but they are at least spatially and plot wise confined.
So, not a TV show, but Small Gods is a Discworld book that minimally interacts with other books in the series. If you’ve never read Discworld and are intimidated by those reading order diagrams, it’s a bottle book.
and it’s fucking awesome 🙌