The ceramic coating would adhere to the surface at a high temperature as the plastic is curing and thus the interior walls of the container would be made of glass, not plastic. This technique in manufacturing is not so difficult and this process would be very easy to do, such added interior strength would mean less plastic material needed to provide for strength and rigidity. The ceramic coating at a thickness of 2-3 mils would be flexible enough to withstand flexing of the bottle itself without coming apart into the inside of the water bottle.
Lance Winslow.
harlan kilstein