Ginger beer
From Tardis Wiki, the free Doctor Who reference
Ginger beer was a favourite drink of the fourth incarnation and eighth incarnations of the Doctor. (DW: The Android Invasion, TN: Rip Tide)
Whilst on what they thought was Earth The Doctor offered some 'ginger pop' (another name for ginger beer) to Sarah Jane Smith, but she disliked it. It was also (partially) because of this dislike he was able to dicern the android version of Sarah from the actual. (DW: The Android Invasion)
The tenth incarnation of the Doctor also used Ginger beer to prevent him from being killed by poison. (DW: The Unicorn and the Wasp)
