Combine dry ingredients in a large mixing bowl.
In a small cup, combine coconut oil, water and essential oil.
Slowly mix liquids with dry ingredients while whisking together. The mixture may start to fizz a little, so it’s important to mix thoroughly right away and not use too much water.
Test your bath bomb mix by grabbing a handful in your fist (see video above).
Firmly press bath bomb mix into the mold; allow to dry overnight.
Carefully remove from mold by gently pressing upside down onto a towel or soft surface.
Mix 1/4 tsp black cosmetic powder with a few drops of isopropyl alcohol until it’s thick enough to brush on.
Use a small brush to paint the eyes, nose and ears. Wait until dry before storing.