DIY bath bombs

Recipes for making your own bath bombs are all over the internet.  As long as you have the basic chemistry proportions of baking soda and citric acid tight you can add just about anything you would like.
Basic bath bombs
2C baking soda
1C citric acid you can find this in the caning section of the grocery store or on line
mix together and then spray with water stir constantly until the mixture resembles damp sand.  Spoon into ice cube trays or silicone molds pack down  and let dry overnight.
You can add fragrance, flower petals, herbs or color.

Even better bath bombs

2C baking soda
1C citric acid
2C epsom salts
1C sea salt
1C corn starch
witch hazel
fragrance and color
Mix the same as above adding liquids last and very slowly so the mix doesn't lose it's fizz
I have used a 2T spoon to packed very tightly or molds.  I have two part molds that make larger bombs but you can also use two part Christmas ornaments.
If you want you can add oils and butters for more moisturizing properties

No mater what there will be some breakage with these, they are fragile.  I just crush up the crumbs, put it into a container and call it bath salts.  I also put the crumbs in small plastic bags and give it to kids at shows.  I call it zombie dust, they love it!