Apologies for being the bearer of gross news, but that water bottle you carry to help you live a healthier lifestyle might actually be home to a healthy population of bacteria. The folks over at decided to branch out into treadmill-adjacent products, and created this study on reusable water bottle bacteria. Measuring the microorganisms in "Colony-Forming Units," they tested different types of bottles to see which is the best, but first, here's what average water bottle looks like: