- Lost Booze -
Pilot Part 1

Jack wakes up in the jungle and finds a bottle of vodka in his coat pocket

Jack gives Kate the bottle from his pocket to use to clean her hands when she stitches him up.  He uses the rest to clean his wound.

In a flashback, Jack pours himself a stiff drink on the plane and the stewardess, Cindy, gives him a couple more bottles in which he pockets one.

(Actually mentioned in Pilot Part 2)

Shannon said she spent a year in Paris "drinking, not studying"