How Safe Is Your Kitchen?
Reality: “We don’t believe there are any dioxins in food-grade plastics,” says Rolf Halden, Ph.D., an assistant professor of environmental health sciences at the Johns Hopkins Bloomberg School of Public Health, in Baltimore. “And even if there were, freezing wouldn’t release them―heating would.” But freezing a disposable bottle is still a bad idea. Disposable bottles are prone to breaking and are hard to clean, making them more likely to harbor bacteria. So drink up, then recycle.
Bottom line: If you want bottles of frozen drinks, stick with containers that are labeled safe for reuse and freezing.