Baking Soda Health Benefits: Natural Remedies & Cleaning Tips

I read Dr. Hulda Clark's book, "The Cure For All Diseases." In it she mentions that most brands of baking soda are tainted with benzene. I know you can buy better baking soda in a health food store, but that's not an option where I live. Is it safe to mix ACV with carbonated mineral water instead? The ACV they sell here is pretty acidic, so I need something to buffer it.