DIY Desodorante, courtesy of the Farmer's Almanac:
Mix ¼ cup baking soda with ½ cup of cornstarch. Add a few drops of essential oil. Shake to mix well. Pat on with a damp washcloth or cotton ball. Adding three tablespoons of coconut oil and stirring well until it forms a thick paste will allow you to refill an old deodorant dispenser and use it as you would the commercial product.