Skip artificially flavored gelatin in favor of this super-easy homemade version using fruit juice. You'll need only unflavored gelatin and your favorite juice (aside from mango, papaya, and pineapple, any kind -- fresh or premade, pulpy or not -- will work).
Place 1 cup fruit juice in a glass bowl. Sprinkle with 2 envelopes (1/4 ounce each) unflavored gelatin. Meanwhile, bring 3 cups juice to a boil. Pour boiling juice over gelatin-juice mixture, and stir until gelatin dissolves completely. Pour into 5-ounce juice glasses, which make great single servings. Refrigerate until firm, about 4 hours. Serves 8.