In a mixing bowl, combine the baking soda, citric acid, corn starch, epsom salt and orange zest. Whisk together until all of the lumps are gone.
In a separate bowl, melt the coconut oil in the microwave. Then add in the orange essential oil and food coloring.Add the oil mixture to the dry mixture and mix well with your hands.
Lightly spritz with water a few times to get the mixture to barely hold together. Make sure you don't add too much water!
Using your hands, 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. For a rustic look, you can even just roll them into balls by hand. I opted to use a silicone flower shaped mold for mine. Just make sure you press the mixture firmly into whatever mold you use.
Let dry for at least 4 hours before carefully removing from molds. Once they're dry, they are ready to use. Add to your next bath and let it fizz.