Meanwhile, in 2-quart saucepan, mix water, 2 tablespoons sugar and the cornstarch. Stir in 1 cup of the blueberries. Heat to boiling over medium-high heat, stirring constantly. Reduce heat to medium; simmer uncovered 1 to 2 minutes, stirring constantly, until slightly thickened. Remove from heat. Stir in remaining 2 cups blueberries.