Lemonade

 was a common Earth beverage derived from lemons. It was made without alcohol. (AUDIO: Autumn) When the Tenth Doctor and Donna Noble visited Earth in 1926, the Doctor said that the air smelled of grass and lemonade with a hint of mint. (TV: The Unicorn and the Wasp)

While lemonade in Britain was carbonated, American lemonade was "meant to be flat". (TV: Dead of Night)

Lemonade was one of the ingredients in the Kandy Man's kitchen. The Seventh Doctor used it to stick the Kandy Man's feet to the floor of his kitchen. (TV: The Happiness Patrol)

The Seventh Doctor persuaded Ace to drink lemonade instead of Pat Rowlinson's homebrewed beer. (TV: Battlefield)

The Doctor drank lemonade on several occasions. (PROSE: Human Nature, PROSE: History 101)

The Pied Piper's realm had lemonade fountains. (COMIC: Challenge of the Piper)

The Eleventh Doctor claimed to have put a tap for lemonade in the kitchen of Uncle Digby's country estate. (TV: The Doctor, the Widow and the Wardrobe)

Lemonade's other uses
The Tenth Doctor destroyed the glutonoid with a toxic mixture that was flavoured with, among other things, lemonade. (COMIC: The Glutonoid Menace)