Vodka is a clear alcoholic beverage.
The pilot, Mischa, drinks vodka on cold nights to keep himself warm. He can sober up quickly with some Coffee.
While sneaking past different Soviet Army soldiers, Cate Archer could overhear some of them talking about "Vodka would be good right now."
One of the Random items that could be found in the Siberian Soviet outpost was bottles of vodka.
While infiltrating a Soviet Army base in Siberia, Archer found a letter from Anya to Sergei where she forgave him for breaking a bottle of vodka over her head.
Vodka on Wikipedia