Add the baking soda to a mixing bowl. Slowly add the water.
Mix well, you do not want it to be really watery.
Place the mixture into your silicone mold or muffin tins. You can let these air dry in the forms for about 2 days or speed up the process with your oven. Simply bake your bombs at 350 for about 15 minutes.
Let the bombs cool completely before you remove from the molds
Add your lavender. I use 5 drops on each bomb. Store in an airtight container and enjoy in your shower!