Bring 1 cup of water to a boil in a small saucepan. Pour the boiling water into a mixing bowl and add the gelatin packet. Stir until the gelatin is completely dissolved. Add 1 cup of cold water to the mixture and stir well. Pour the mixture into individual dessert cups or a large mold. Add fresh fruit pieces if desired. Refrigerate for at least 4 hours or until set. Serve chilled with whipped cream on top if desired.