Bring the water to a boil in a large pot, and remove from the heat. Add the tea bags, ginger, lemon, and lime juices and sugar. Allow the tea to steep for 10 minutes, remove the tea bags and cool the tea. Stir to be sure that the sugar is dissolved, and place in a large pitcher. Refrigerate until thoroughly chilled.
Just before serving, add the vodka to the tea and serve in tall glasses filled with ice. Garnish with lemon and or lime slices.