It doesn't get any simpler than this. Hydrostones are leaf-shaped pieces of terra cotta clay that have the ability to absorb a good amount of moisture. Pour a little distilled water in a plate and lay the Hydrostone in it. The Hydrostone will soak up the water but will still be fairly dry to the touch. Then, just drop the Hydrostone into your humidor jar or pouch and it will keep your favorite blend fresh for a week or more.