Cornstarch. A less fancy solution to keeping shoes deodorized and dry is to sprinkle the inside with 1 to 2 teaspoons cornstarch.
Salt. Add table salt or Epsom salts to water for a foot soak. Pour a few teaspoons of salt into a tub of warm water. Soak for ten minutes.
Vinegar. Soak your feet several times a week in an apple cider or plain vinegar bath. Mix 1/3 cup vinegar into a bowl of warm water. Soak for 10 to 15 minutes.