Gilligan's Island - Season 1 - Eps 14: Water, Water Everywhere
Talk about a painful irony: though surrounded by water, the Castaways suddenly discover that their supply of fresh drinking water is running out. When they pool all available drinking water together and decide to ration it, they discover that they will each receive only a few drops per day. Of course, most of the castaways sneak water from the community supply when Gilligan is standing watch, but return it when the Skipper catches them. Just when all seems lost, Gilligan saves the day!
About Gilligan's Island

Title: Gilligan's Island
First Air Date: 1964-09-26
Last Air Date: 1967-04-17
Status: Ended
Rating: 7.431/10 (from 238 votes)
Language: EN
Seasons: 4
Total Episodes: 98
Network: CBS
Genres: Comedy, Family
Production Companies: United Artists Television, CBS, Gladysya Productions
Synopsis
The slapstick adventures of hapless Gilligan, long-suffering Skipper and their gang of mismatched castaways, all stranded on an uncharted desert isle after their tiny ship hit stormy weather.
Cast

Bob Denver
Gilligan

Alan Hale Jr.
Jonas "The Skipper" Grumby

Jim Backus
Thurston Howell, III

Natalie Schafer
Eunice "Lovey" Wentworth Howell

Tina Louise
Ginger Grant

Dawn Wells
Mary Ann Summers

Russell Johnson
Roy "The Professor" Hinkley