Put the powdered clay in a bowl, then mix in a little warm water at a time, until the mixture has formed a paste with a consistency similar to peanut butter. Use a wooden spoon, not a metal instrument. The amount of clay you will need will vary according to the size of the area of skin you plan to apply it to. You will want to prepare enough to apply the clay in a thickness of about 1/8 inch.
Use a wooden spoon to spread the warm clay onto a piece of clean, natural porous cloth large enough to cover the area being treated. Muslin, cotton, flannel or wool make goos cloths for clay packs. If you are applying the clay pack to a large area of the body (e.g., the abdomen), you can cut up and use a disposable “incontinent” pad for this purpose.