While it seems like a good idea, it is not safe to use plastic water bottles again. BPA, a chemical that can disrupt normal hormonal systems, has been found in plastic water bottles, and other dangers are present.
The simple answer is yes. Even if you wash out your water bottles in between uses there are a variety of chemicals that can leach into your water (including DEHP and BPA). In fact, washing your bottles out might actual cause the plastic to break down, releasing even more chemicals into your water. Reuse can also increase the percentage of toxins in your water. Extreme temperatures may also accelerate the breakdown of plastic bottles, and, in turn, that breakdown means more little nasties in your h2o.
As an additional point of reference the EU banned products with BPA for kids three and younger. There was also a class-action lawsuit in 2007 against Gerber, Playtex, Evenflo and Avent for products containing BPA. If you must reuse plastic water bottle try and use plastics coded 2, 4 or 5.
I prefer to use a SIGG aluminum water bottle for daily use, and a Camelback water bladder for hiking and camping. Aluminum water bottles, as noted at About.com, are safer, just as convenient as plastic bottles, and are also recyclable.
If you were going to reuse it again right after you wash it out, I’d say fine. Other than that NO. You run the risk of bacteria entering the bottle and other particles. You are better off using a water bottle that has a tight lid. It’s more difficult for germs to enter.
As mentioned, if you wash it first, the heat from the water will cause the bottle to start breaking down a leeching chemicals into your water. And if you don’t wash it, you’re exposing yourself to unnecessary bacteria. Aluminum or stainless steel reusable water bottles are fantastic, maintain a clean taste, and come in a variety of shapes and sizes.
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