2 cups of baking soda.

20 drops of an essential oil of your choice.

½ cup coarse salt (optional).

A little water.

Instructions

Mix the baking soda, soda crystals, citric acid and coarse salt in a bowl, and using a sprayer, moisten your mixture with a little water, while stirring.

Continue adding water until you obtain a compact powdery texture. Then, fill the compartments of your ice cube tray with this mixture and pack it well to have compact pellets.

Let it sit for 24 hours in the fridge and then turn the ice cube tray over to loosen your tablets.