This is the fruit dip recipe I use as icing on my no bake Watermelon Cake. It is made with Cool Whip, cream cheese, vanilla and powdered sugar. If you like the taste of cheesecake, you'll love this dip. Another delicious fruit dip recipe to try is my family's all-time favorite 2-ingredient fruit dip made with marshmallow fluff and cream cheese. I think it would work well on the watermelon cake, too, I just have not tried it ...