2 Ingredient Bath Bomb Recipe – The Easiest Bath Bombs To Make

If you’ve ever found yourself swooning over those pricey, pastel-colored bath bombs in stores but didn’t want to spend $10 on a single fizz, I’ve got the simplest solution for you. You can make your very own bath bombs with just two ingredients—yes, two!—and a splash of water. That’s it. No citric acid hunting, no fancy oils, and no fluff. This beginner-friendly bath bomb recipe is quick, easy, and perfect for kids, gifts, or a quiet afternoon craft session just for you.

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What you need

1 cup baking soda (bicarbonate of soda)

 

½ cup cornstarch (aka cornflour in Australia)

 

Water (in a small spray bottle)

 

Optional Add-ins (but still technically 2 ingredients without these):

A few drops of essential oil (lavender, peppermint, or lemon are lovely)

 

A few drops of food coloring or soap dye

 

Dried flower petals or lavender buds

 

Coconut oil or almond oil (for a little moisture boost)

 

Mica powder for shimmer

Instructions

 

 

Instructions – How to Make 2-Ingredient Bath Bombs

1. Mix the dry ingredients

In a medium-sized bowl, combine 1 cup baking soda and ½ cup cornstarch. Stir until fully blended and smooth. No lumps allowed—use your fingers or a sifter if needed.

2. Add optional extras

If you’re using essential oils or color, add just a few drops now and mix quickly. Avoid over-mixing or adding too much liquid—your bath bombs might fizz prematurely.

3. Hydrate slowly

Fill a spray bottle with water and lightly mist the dry mixture, 1–2 sprays at a time, stirring constantly after each spray. Be gentle—too much water too fast and it’ll start fizzing before it gets to the tub!

You’re aiming for a damp sand texture—like moon sand. When you squeeze a handful and it holds its shape, you’re ready to mold.

4. Mold it

Scoop the mixture into your molds, pressing it in firmly. You can use:

• Silicone molds 
• Mini muffin tins 
• Ice cube trays 
• Even plastic Easter eggs 

Let them sit in the molds for at least an hour, or until they feel firm to the touch.

5. Dry and set

Pop your bath bombs out and place them on a tray or towel to dry overnight. They’ll harden beautifully and be ready to fizz by morning.

How to Use Your Bath Bombs

Drop one into a warm bath and enjoy the gentle fizz and skin-softening soak. Because these are made without citric acid, the fizz is lighter but still delightfully bubbly. Add a bit of bath oil or bubble bath if you want to amp up the spa vibes.

Tips & Variations

• Moisturizing Upgrade: Replace 1 tbsp of baking soda with coconut oil or almond oil for a richer soak. 
• Kids’ Version: Use fun silicone molds like dinosaurs or stars and let the kids decorate with dried flowers or a touch of glitter. 
• Holiday Gift Sets: Wrap a few bath bombs in cellophane with a ribbon, and you’ve got an easy handmade gift for teachers, neighbours, or stocking stuffers. 

Storage Tips

Keep your bath bombs in an airtight container or glass jar with a lid to prevent moisture from sneaking in. A sachet of rice in the bottom helps absorb any excess humidity.

These 2-ingredient bath bombs are a game-changer for beginner crafters or anyone craving a homemade touch without the stress or mess. Whether you make a small batch for yourself or a big batch for gifting, they’re a fizzy little luxury you can whip up in under 30 minutes. No fancy tools, no odd ingredients—just simple self-care, one bath at a time.