We all use water bottles on a relatively consistent basis, whether we want to or not. They are everywhere — at the market, in fast food establishments, and in our cupboards. Often, in the name of environmentalism, we opt to re-use our water bottles, even if they are of the disposable variety.
The question is, can re-using our water bottles in this way be negatively affecting our health? In some cases, the answer is yes. There are three crucial things that you should know about before refilling your empty bottle with some good old H2O, so hang on to your Brita filters — let’s jump right in.
1. Bacteria can thrive in water bottles.
While you should be OK if you use a disposable water bottle only once (as is intended), you are pushing your luck if you decide to use it again. Indeed,studies have shown that with prolonged usage, disposable bottles acquire scratches and cracks that can harbor nasty types of bacteria. It is not unlike your cutting board, which must be cleaned very thoroughly in order to ensure that all of the bacteria hiding in its gouges are eliminated.
Cleaning out your disposable water bottles cuts down on some of the risk, especially if you use warm soapy water. Still, even that presents a problem, as cleaning those kinds of bottles might damage them further (since they were not designed with re-usability in mind).
It is also important to remember that the bacteria inside of your water bottles gets there via your mouth. So if you do not wash them out, days and days worth of bacteria collects inside of them, turning your bottle into something not unlike a laboratory petri dish. One study from the University of Calgary found that a group of elementary student’s water bottles — which had been re-used several times over without being washed — contained levels of bacteria that went far above what is recommended to be present in your drinking water. This in part had to do with the fact that these bottles sat in room temperature for most of the day, which gave the bacteria present within the bottles the perfect conditions necessary to grow and



As co-founder of Hotwire.com and CEO of Zillow for the last seven years, 39-year-old Spencer Rascoff fits most people’s definition of success. As a father of three young children, Spencer is a busy guy at home and at work.