Polycarbonate water bottles don’t contain any dangerous amount of BPA. It’s a marketing ploy by 3m Eastman to force people to use lower life cycle plastics. Tritan cracks at 2 years old, and polycarbonate lasts at least 20 years. They know polycarbonate is safe because we haven’t stopped using it in high-impact kitchen appliances like food processors and blenders. They created a shittier plastic that hurts the environment to make more money.
Cheap canned goods are literally lined with BPA. Polycarbonate bottles have fuck all to do with humans’ BPA exposure. If you own a polycarbonate water bottle keep using it, it has no BPA on it after the first time you wash it.
Source: MS mechanical engineering focused in polymers. One of my profs posted a few papers on this.
Edit: This (PDF LINK!!!!) is the paper if anyone is wondering. It found negligible amounts of BPA compared to canned goods after holding polycarbonate waterbottles full of water at 120C for 2 hours. Which would never happen in a real world situation.