Combine baking soda, citric acid, corn starch, epsom salt, and orange zest in a mixing bowl. Whisk till free of lumps.

Melt coconut oil in a small glass bowl in the microwave. Add the orange essential oil and food coloring if desired.

Add the oil mixture to the dry mixture and mix well with your hands. Lightly spritz with water a couple of times to get the mixture to barely hold together. Don't add too much!

Press the mixture firmly into molds. I used cute flower molds, but you can use a plastic ornament mold, or even a plastic Easter egg.

Let dry for at least 4 hours before carefully removing from molds.