Thank you john.
I guess only the big 5 gallon water jugs are Polycarbonate, not these.
I did some reading after reading your post and found, among other things, that the first plastic (PET) drink bottle was patented by the brother of a famous American painter:
"The first PET bottle was patented years later in 1973. At that time, Nathaniel Wyeth created the first official PET bottle under this patent. Wyeth was the brother of a well-known American painter named Andrew Wyeth."
Those clear plastic microwave meal trays are made from it and it is generally considered safe although indeed it can leach out chemicals if re-used.
Most disturbing is a warning about re-using those water bottles for, say, backpacking water containers:
"Recent studies have shown that reusing bottles made of PET can in fact be dangerous. PET was found to break down over time and leach into the beverage when the bottles were reused. The toxin DEHA also appeared in the water sample from reused water bottles. DEHA has been shown to cause liver problems, other possible reproductive difficulties, and is suspected to cause cancer in humans. Therefore, it's best to recycle these bottles without reusing them." (edit: this could also be urban legend rather than science. See comments further down in the thread.)
I also found out that Mylar is PETE plastic.