Hi there!
You can buy these ingredients from a range of online and local suppliers. Think natural ingredient suppliers, herb shops, or health-food stores. If you are located in EU, I have another article here that talks about the best e-shops to buy from.

And in this article here I'm talking about how to make your own clarifying shampoo. Let me know if you have questions! 🙂

Cheers,
Gabby

Where can I buy all these ingredients?

Also, how do I make my own homemade shampoo, conditioner and scalp scrub (exfoliate) for my dry hair? I'm wanting to make a moistorizing shampoo and condition that will moisturize my dry scalp and hair and get rid of the dry flakes that are on my scalp.