In a large bowl, sprinkle 3 envelopes of unflavored gelatin over 1/2 cup fruit juice (orange, grape, apple or pineapple). Let stand a few minutes. Microwave for 1 minute on high, until gelatin is dissolved. Mix with 2 1/2 cups fruit juice, stirring to blend. Pour into 8-inch square dish. Refrigerate until firm. Cut into 1-inch squares. They will be chewy like gum drops.