deadly nanobot ice cubes. There are a number of reusable cubes made from silicone or stainless steel out there, and though they're innovative, save a water, and can chill drinks without diluting ...

Simply put, the best reusable water bottles turn ... This tumbler keeps drinks cold for up to 11 hours, and if you toss in ice? Cubes stay intact for a ridiculous 28 hours. Tester feedback ...