Combine the baking soda and Epsom salts. Stir very well, making sure to get rid of any lumps that may have formed in the baking soda.
Add the eucalyptus leaves and stir into baking soda/Epsom salts mixture.
Add essential oils, then add water and stir well. You should have a somewhat pasty mixture that will form into a ball or shape well.
Spoon mixture into one half of a bath bomb mold, pressing firmly to fill the entire mold.
Let set 24-48 hours to set.
To remove from mold, flip mold over and tap lightly with a spoon. They should come out fairly easily.
Store in an airtight container and put one in the bottom of the shower close to the drain to help alleviate nasal congestion.