Researcher Dispels Myth of Dioxins and Plastic Water Bottles: Dr. Rolf Halden says "There are no dioxins in plastics." but "If you heat up plastics, you could increase the leaching of phthalates" and "It is very important to drink adequate amounts of water ... Unless you are drinking really bad water, you are more likely to suffer from the adverse effects of dehydration than from the minuscule amounts of chemical contaminants present in your water supply."