In a bowl combine your dry ingredients together.
Carefully add your essential oils to the dry ingredients ensuring that you don’t add them all in the one spot. You want your dry ingredients to be moist enough to clump together like damp sand but not to wet that they start reacting with each other.
Now start adding a small amount of water at a time until you achieve a slightly damp mix. You want to avoid the mixture fizzing as you do this – spraying the water in can help with this.
Now it’s time to spoon your mix into the silicone moulds and leave to dry overnight or if you can 24 hours. The toilet bombs will be fragile at first but will harden over the next few days.
Carefully remove the toilet bombs from the silicone mould and place in a sealed jar. I recommend popping a recycled silica sachet into the jar to absorb any moisture.