Skip artificially flavored gelatin in favor of this super-simple homemade version using any fruit juice you like.
Place 1 cup juice in a glass bowl. Sprinkle with gelatin. Meanwhile, bring remaining 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.