Combine all ingredients in a large punch bowl; stir until combined. Place lemon slices and blueberries on top of punch. Serve in punch cups or small glasses. Refrigerate leftovers. Makes approximately 14 6-ounce servings. Per Serving: Cal. 42 (2% DV), Fat Cal. 0, Pro. 0 g (0% DV), Carb. 11 g (4% DV), Fat 0 g (0% DV), Chol. 0 mg (0% DV), Sod. 7 mg (0% DV), Vit. A 0 RE (0% DV), Vit C 10 mg (16% DV), Vit. E 0 mg (0% DV), Calcium 1 mg (0% DV), Iron 0 mg (0% DV), Folate 0 Ug (0% DV), Zinc 0 mg (0% DV), Pot. 23 mg (1% DV), Dietary Exchange: Fruit 1