In a blender, puree the berries until smooth. Strain through a fine mesh sieve to remove seeds, if desired.
In a large pitcher, combine the berry puree, lemon juice, and sugar. Stir until the sugar is completely dissolved.
Add cold water and mix well. Taste and adjust sweetness by adding more sugar or water as needed.
Chill in the refrigerator for at least 30 minutes before serving.
Serve over ice, garnished with lemon slices and fresh berries if desired.
Prep Time: 10 minutes | Cook Time: 0 minutes | Chill Time: 30 minutes | Total Time: 40 minutes
Kcal: Approx. 90 per cup | Servings: 6