- In a medium bowl, mix together water and baking soda. 
- Add in the peppermint and eucalyptus oil. 
- Stir the mixture well. 
- Spoon the mixture into a silicone baking pan. 
- Bake the melts in a 350 degreen oven for 20 minutes. 
- Let the pan of melts cool before de-moliding the shower melts.