Bring 2 cups of water to a boil. Add tea bags. Let steep. On the stove top, heat the 7 cups of water and 2 cups of sugar until sugar is dissolved. Combine tea, sugar/water mixture and the frozen juices and vodka. Freeze completely. (It will not freeze solid due to the vodka, and this is why it is like a slushy when scooped out.) Scoop out vodka mixture that has been frozen with an ice cream scoop into glasses. Top off with a splash of 7-Up or lemon lime soda.