My kids love taking baths and they love using fizzy bath bombs when they do. Here is a quick tutorial on how to make them yourself...
Materials: 1 cup baking soda, ½ cup citric acid, ½ cup corn starch, ¼ cup fine sea salts, ¼ cup powdered cow or goat milk, 2 teaspoons apricot oil, 1 teaspoon melted shea butter, 1 teaspoon essential oil (scent of your choosing), 3-5 teaspoons witch hazel, dried flower petals or food coloring (optional), molds…just about anything rigid will work (Dixie cups, plastic Easter eggs, small silicone baking or ice cube molds, yoghurt cups, etc.)
Mix all dry ingredients together well with a spoon or mixer on low speed.
Mix the apricot oil, melted shea butter and essential oil together and drizzle over the dry ingredients, while mixing on low speed.
Gradually add the witch hazel (plus a few drops of food coloring). The best way to do this is to put the witch hazel into a spray bottle and squirt it into the other ingredients while constantly stirring. This is because too much added at once will activate the fizzing action and make hard, clumpy bits in your bath bomb. 
It has reached the right consistency when the mixture holds its shape like dry snow. 
At this point, pack it into a mold as tightly as possible.
Wait 5-10 minutes then tap out the bath bombs onto a flat surface.
Let them dry overnight and store in an airtight container to protect them from moisture until they are ready to be used.
