Our environment and foods and drink are full of 'chemicals'. Each has a different risk level. Tobacco smoke carries a major known risk so most now avoid it. There are nitrites in processed meat and toxins apparently in barbequed meat, but I'll bet most folks don't give that a second thought when they eat a corned beef sandwich perhaps or a burger off the barbeque, or if they do they just eat less. As homebrewers we are exposed to all sorts of chemicals in the kit we use, plastic FVs, plastic tubes, sanitising chemicals, campden tablets etc etc, some of which gets into the beer. But the chemical that creates the most danger to us all due to its concentration and known toxicity is the very thing we strive to produce which of course is ethyl alcohol, and thats ignoring all the other organics that are present in smaller concentrations due to the fermentation process. So if you willingly saviour your 5%ABV beer or 10 %ABV cider it is ludicrous in my view to have any concern about the slight possibility of a few ppb of a rogue PET based chemical being in your drink. There are certainly bigger risks to your health out there and certainly in your glass.