Add the baking soda, citric acid, epsom salts, and kaolin clay to a bowl, and stir with a whisk until all of the ingredients are completely combined.

Mix the sweet almond oil and water together. This mixes easiest if you shake it in a small jar.

Slowly pour the liquid into the mixture while whisking. You want to do this drop by drop so as not to activate the fizz, otherwise you may ruin the mixture. Whisk together until you have a mixture that easily clumps together.

Overfill two halves of the bath bombs mold, press together, and give a quick twist. Allow the mixture to set in the mold for 1 hour, then you can unmold and allow to set overnight to completely harden.