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MenScience Advanced Deodorant- www.menscience.com Fragrance Free, Odor Free, Stain Free, Aluminum Free

I have been using the THAI CRYSTAL (brand) Deodorant Roll-On, and I really like it. But, I would like to save money and make my own to use. I have saved several roll-on bottles to fill if I can find the recipe. The ingredients listed on the bottle are: "mineral salts and filtered water." I am not sure what sort of mineral salts to use, or the ratio of salts to water as well as the details of preparation. Thank you in advance for your help!