Combine the orange juice concentrate, milk, water, sugar and vanilla into a high powered blender. Blend until smooth. Consistency of orange juice concentrate can vary, so you can add more water if the beverage is too thick.
Add ice to about 3/4 of the way full and blend until a drinkable texture.
Pour into glasses and garnish with an orange slice.
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Notes
Vodka or champagne is optional. If you are adding vodka to the whole batch, add 4 ounces (1 regular sized shot glass = 1 ounce, so 4 shot glasses) with the rest of ingredients when blending. If adding to individual drinks, add the shot straight to serving glass and stir before serving. If you choose to use champagne do NOT add during the blending process, it will decrease the carbonation. Add it to each glass individually and stir gently or just use it as a floater.