Place lemon slices in a large pitcher. Carefully rub the 1-1/2 cups mint leaves between the palms of your hands to slightly bruise the leaves. Add to the pitcher with lemon. Pour in water. Cover and chill for 1 to 8 hours.
Strain lemon-water mixture. Discard herbs. Divide lemon slices and additional fresh mint or basil sprigs equally among 6 to 8 tall glasses or pint-sized canning jars. For each serving, add 1 cup of ice cubes; fill with the lemon water. Makes 6 to 8 servings.