Ribena
From Tardis Wiki, the free Doctor Who reference
Ribena was served at the buffet of Lady Aesculapius's funeral in place of alcohol, though they drank it in wine glasses. (PROSE: Life After Death)
Behind the scenes
In non-valid sources
While arguing with his fellow Doctor actors over the size of Tom Baker's part, Sylvester McCoy had a carton of Ribena. (NOTVALID: Doctor Whoah! 379)