I surely hope not!! I drink about half a box of the mix it yourself kind every day!! If there's something slimey looking in the bottom of the pre bottled kind, then it's not good! Don't drink it! I've seen it do that when I left one in the car & it got hot!
There is no mention of the presence of chemical byproducts or sludge in propel zero bottled water. The water is only mentioned to contain vitamins as well as antioxidants. You should avoid drinking water that has such contents.