If you are looking for a drink container which has a completely inert lining, you might try SIGG Bottles from Switzerland. These bottles are extruded from a single piece of pure (99.5%) aluminum. They are strong, lightweight, and do not contaminate their contents with phthalates, Bisphenol-A or other potential toxins. The liner is a food grade, water-based resin that is sprayed and baked on to the bottle. It has undergone extensive tests in Switzerland and Germany. It contains no petroleum products, and exceeds all associated FDA requirements for food liners. They also make similar bottles for infants and children.
They are available from Amazon for $12-$20 each.