Hello to all.
Number 7, your post is not quite correct.
Bisphenol A (BPA) is used in manufacture of some polycarbonate materials. However, some polycarbonate materials are not manufactured with BPA so it is incorrect to imply all polycarbonates contain BPA.
Also, the "7" you see on some plastics refers to polycarbonate plastic, not BPA. So, not all "7"s you see on the bottles contain BPA.