Blackberry Lemonade

3 cups fresh blackberries
7 cups water
1/4 cup sugar
1/4 (1.9-ounce) package sugar-free pink lemonade drink mix
Garnishes: fresh mint sprigs, lemon slices

Process blackberries in a blender until smooth, stopping to scrape down sides. Pour through a fine wire-mesh strainer into a 2-quart pitcher, discarding solids; stir in 7 cups water, sugar, and drink mix. Serve over ice; garnish, if desired. Yield: 2 quarts.

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