Here's a good recipe to making homemade bath bombs and it's what I used to make bath bombs at home.
Ingredients you'll need to make bath bombs.
1 cup baking soda
1/2 cup citric acid
1/2 cup corn starch
1/4 cup epsom salt
1 tsp orange zest
1/4 cup coconut or almond oil
16-20 drops orange essential oil
Orange food coloring (optional)
Water
Combine baking soda, citric acid, corn starch, epsom salt, and orange zest in a mixing bowl. Whisk 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 water.
Press the mixture firmly into molds. 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.
And now you have some cheap and easily made bath bombs.