Inevitably, even the sturdiest materials will break down over time. Though the average lifespan varies, experts suggest that ...

Every time you take a sip of water, you may also transfer bacteria from your mouth to the lip or spout of your bottle. These microbes can sometimes clump together with fungi to form slimy biofilms.

Is it okay not to clean my water bottle for a month? Not cleaning your water bottle for an extended period of time can lead to potential accumulation of mold and bacteria, Dr. Connor says.