15 drops essential oils, such as Thieves, Purification, Tea Tree, Lemongrass or Peppermint (I really love 10 drops Lemongrass + 5 drops Peppermint together or if you're going for simple try 15 drops of Purification)
In a large bowl, mix baking soda and citric acid ingredients together well.
Very slowly (a few drops at a time) add hydrogen peroxide to baking soda/citric acid mixture. Mix well as you continue to add hydrogen peroxide. You may notice some fizzing - just keep stirring. (Note: Don't dump the hydrogen peroxide all at once as it will activate the baking soda and citric acid. It's important to stir it in very slowly.)
Slowly add essential oils to mixture and keep mixing well as you add the essential oils.
Test mixture. You should be able to clump it together to mold. It shouldn't be too wet or too dry. If it's too dry, add a couple of drops of hydrogen peroxide.
Fill a silicone mold with mixture OR form small balls (about the size of Brussel sprouts) with your hands and place on a sheet pan lined with parchment paper (to avoid sticking).
Allow molds to air dry - about 6-8 hours. Then transfer to a glass jar and store in the bathroom.
How to Use
These Homemade Toilet Bomb Fizzies are really easy to use. Simply take 1-2 toilet bombs and drop it directly into the toilet. The toilet bombs will fizz as the baking soda and citric acid react together in the water. Use a toilet brush to gently scrub all surfaces inside the toilet.