leatherizing the feet

I am going barefoot as much as possible to get tough. Eve, the twins and I went to Valley Green for a walk, I went shoeless Joe Jackson. Mostly gravel and small stones covered the path, with the occasional partially decomposed sticks (very soft) and horse poop ( very soft.) Do they sell feet sanitizer? The water running down the Wissahickon schist cliffs over the trail to the creek was quite cold, and made everything painful. One step at a time.