Bath Buddies Soap Ivory Snow detergent (or any other soap flakes) Liquid food coloring Water Vegetable oil Bowl String (for soap on a rope) Pour approximately 3 cups of soap flakes into the bowl. Add 1 to 1 1/2 cups of water with a few drops of food coloring added to it. Mix the contents of the bowl with your hands until it becomes the consistency of play dough. To shape it, take a drop or two of vegetable oil and rub it between the palm of your hands, then shape any way you wish. If you want to make a soap on a rope, cut a piece of string and tie the ends together. Push the knotted end gently into the your finished shape. Let the completed soap stand to set overnight.