Don't Drink The Water is taken from a play by Woody Allen. Walter Hollander (Jackie Gleason) is a middle-aged caterer from Newark, New Jersey who takes his wife Marion (Estelle Parsons) and his teenage daughter Susan (Joan Delaney) on a tour of Europe. When their plane is high-jacked to Vulgaria, Walter is mistaken for an international spy when he takes some photographs. Secret agent Krojack (Michael Constantine) is dispatched to capture the alleged spy. The family takes refuge in the American embassy where Axel Magee (Ted Bessell) is the son of the ambassador. Axel arranges for the family to stay there, but leaving then becomes the problem. Susan's problems are solved when she and Axel are married, providing her with diplomatic immunity. Walter and Marion are forced to disguise themselves as part of an Arab delegation to escape from Vulgaria.