Comment by gloosx

1 cup baking soda, 1/2 cup citric acid, 1/2 cup cornstarch, 1/2 cup Epsom salt, 2.5 tbsp oil (like coconut), 3/4 tbsp water, 10–20 drops essential oil

Combine wet into dry slowly until it feels like damp sand.

Pack into molds, press firmly.

Dry for 24 hours before using.

Drop into a bath and enjoy the fizz!