The whole problem lies in the container itself. After the expiration date, microscopic chemicals can enter the water. These compounds can make the water taste like medicine, chlorine, or something else.
Some of these chemicals are more toxic than others, for example, antimony can damage the stomach and intestines, and phthalic acid esters can disrupt the endocrine system.
In addition to time, the release of these substances from the bottle can also be affected by temperature. If you’ve kept a water bottle in your trunk for a long time over the summer, it’s best not to risk drinking it.
Source: Ferra
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