• 2 cups citric acid
• 6 cups baking soda
• 5-10 drops essential oil, or more if desired
• Food coloring (optional)
• 2 tsp dried flowers or herbs (optional)
• Witch hazel in a spray bottle

Mix the citric acid and baking soda with your hands in a large bowl or clean plastic bucket. Add essential oil, food coloring, and dried herbs. Add more oil and coloring if desired.

Begin adding the witch hazel. Go slowly and be careful at this stage, because too much witch hazel added too quickly will cause the bomb to go off while you're mixing it (the fizz will become activated with too much liquid, and there will be none left for bath time). Spray the mixture with witch hazel - 2 or 3 sprays, then mix and knead. Repeat spraying, then knead, until you have a consistency that will hold together when you squeeze a handful of it. It should be like wet sand for building sand castles - not too wet. Take your time - allow 10-15 minutes for mixing. Once it has achieved the proper consistency, press it into molds (such as jello molds) or form it into balls in your hand. Let dry overnight.

Recommended herbs & flowers: chamomile, marigold, ground apricot kernel, lemongrass, rose petals. Store in an airtight container.

Package in cellophane bags or glass jars. Citric acid can be obtained online at americanspice.com. Essential oils & herbs from a local health store, or online at lorannoils.com.. Kerr canning jars can be found at most grocery stores, or order specialty jars online at Weck Jars or Specialtybottle.com.