essential oils(I used 30 drops each of lemon and orange)
Instructions
In a glass bowl, mix together the baking soda and citric acid in a glass bowl. I suggest wearing a mask and some latex gloves for this to protect your skin and eyes.
Slowly mist the dry powder with water, mixing as you go. You want to barely wet the powder to get it to stick together in the mold. Literally, 1-2 sprays should be enough. Too much will cause fizzing.
Add the essential oils and continue mixing.
Using a ½ or 1 teaspoon measure, scoop out spoonfuls and place them on a piece of parchment paper until dry. You could also use a silicon mold for this step.
Let the fizzies dry overnight and carefully place in an airtight container to use as needed.
Notes
I haven't tried flushing the toilet before this has fully dissolved, but I would not suggest trying it (I'm thinking that kind of pressure in pipes isn't the best idea!)