8 thin lime slices (optional)
Fresh blackberries (optional)
Place 1 cup water and 3 cups blackberries in a blender; process until smooth. Press blackberry puree through a sieve into a large pitcher; discard seeds.
Add remaining 5 cups water, sugar, limeade and vodka to pitcher; stir until sugar dissolves.
Note: you can omit the vodka for an all ages drink.