As the weather is heating up and summer is upon us, it's good to know what the "standards" are for keeping bottled water in the car. There are people who swear that leaving a bottle of water in a hot car releases harmful chemicals into the water, and people who scoff at that idea.

In the summer, it seems like different places contradict themselves - both advising that you should always have water in case you get stranded, but also that drinking bottled water that has been heated up can be an issue.

According to the International Bottled Water Association, this claim that circles via social media every summer, is untrue. The plastic used for water bottles (the same plastic that is used for juice bottles, peanut butter, and other foods) is approved by the FDA and won't have the same issues as other compounds.

When the interior of your car gets above 90 degrees (which can happen in minutes in the sun of a parking lot), there can be chemical changes in plastic. However, a study was recently done that kept bottled water at nearly twice that temperature for four weeks (considering this a worst-case scenario) and all the water tested at EPA acceptable levels.

In general, no one recommends storing your water in a hot car or exposed to extreme heat or direct sunlight. But a bottle of water left in the car for a day or two is extremely unlikely to do any harm at all. In fact, the bigger risk comes from drinking, recapping, and drinking again, as this causes bacteria to flourish.

In short, keeping water in the car with you is far safer than eschewing any water that may have heated up. If you are still uncomfortable with bottled water, make sure you keep a glass or metal water bottle filled in your car at all time.

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