One of the most effective deodorants are made from Baking Soda. You can dab baking soda on your underarms and leave for sometime. Then, remove the excess with a tissue paper. Wear on your clothes. You would be odor free through out the day. You can mix the baking powder with some essential oils of your choice. Do the mixing in small batches and finish the batch before making other.
Another natural deodorant is Potash Alum (called ‘phitkari’ in Hindi). It is crystalline in nature and is, generally, colorless. It can be rubbed on the armpits and left. It reduces the body odor. Ammonium Alum can also be used as a natural deodorant.