Ginger beer

The Tenth Doctor drinks a bottle of ginger beer. (DW: The Unicorn and the Wasp)

Ginger beer was a favourite drink of the fourth and eighth incarnations of the Doctor. (DW: The Android Invasion, TN: Rip Tide) It is similar to ginger ale, but with a much stronger, more pungent aroma and flavor.

While on what they thought was Earth, the Fourth 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 discern the android version of Sarah from the real one. (DW: The Android Invasion)

The tenth incarnation of the Doctor used ginger beer as one of the ingredients necessary to prevent poisoning by cyanide. (DW: The Unicorn and the Wasp)

Ginger beer seems to have a strong effect on Time Lord physiology; for instance, it reduces the ability to tolerate alcohol. (BFA: The Kingmaker)