THIS is the best recipe I have found for making deodorant.
2 T baking soda
2 T starch (arrowroot powder or corn starch)
3T coconut oil
Mix the baking soda and starch then add the coconut oil in until smooth.
Put in a silicone container (or muffin liners) and refrigerate until hard.
Use like regular deodorant. This amount lasts about 2 months.