This is an interesting question because the makers of BPA-free water bottles have kept the ingredients a secret. All that is publicly known about this kind of water bottle is that, like polycarbonate, they fall into the #7 category of “other” plastics in the plastic container identification system. That’s the number which appears inside the triangle on plastic containers. When it comes to 1 through 6, the numbers are fairly informative, but so far 7 has been a mystery number.
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