@engineer Yeah he said it's HDPE.
HDPE is insoluble in ethanol, and has a molecular weight usually in the hundreds of thousands - you can't asborb it trandsermally, or even orally.
Even if the polymer broke down (maybe if you boil your bottle for a day), then the HDPE would break down into ethylene. Ethylene might have some endocrine effects (ethylene oxide does, but I haven't researched ethylene), but its a simple hydrocarbon that your body would get rid of very rapidly.