Hold on to your sweatbands, everybody. If you don’t know how to clean a water bottle, you're going to want to learn ASAP, because there's a good chance your favorites are teeming with germs.

Ryan Holmes, director of product development at HydroJug, says, "You should treat your reusable water bottle just like any other dishware you own and clean it thoroughly and frequently.

Here's what scientists say you can do about it. Carl Behnke had always wondered how clean his reuseable water bottle was. When he stuffed some paper towels inside and smeared them around ...

So, if you’re as wedded to your trusty water bottle as I am, spare some time to give it a regular clean. Your stomach will thank you for it. You’re now subscribed to all our newsletters.

Clean water soon could join a list of issues – smog, the minimum wage, gun control – as an area where California law goes further than similar laws in the rest of the country. But here’s the ...