Add baking soda to a mixing bowl and use a fork or whisk to break up clumps. Baking soda naturally cleans and eliminates odors, making it the perfect base for the fizzies.
Now SLOWLY drop by drop, add hydrogen peroxide to the baking soda. If you add it all at once, you'll have a big mess due to the reaction between the baking soda and citric acid!
Now add the essential oil and gently mix. This is just for scent, so you can choose any scent you like. I used lavender. Use a half teaspoon to scoop the mixture into your candy molds, and press in gently with your fingers. You don't want to fill them completely full, because this will expand. Let dry for at least 6 hours or overnight.
Place the dried toilet bombs in glass jar and keep them sealed near your toilet. Make sure you label them and keep them out of reach of small children! The next time things get smelly, after flushing, drop in a fizzy toilet bomb and things will freshen up in no time.
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Notes
I prefer to use lavender, lemon, rosemary or peppermint essential oils.Lavender Doterra is the brand I have used. The smell lasts quite a while for me with this oil. I can't speak to how long the scent of any other brands might last.(which you can find near the canning supplies at some store