Even though I'm not going to the gym these days, I still love to keep a reusable metal bottle by my bed so I can have easy access to cold water in the middle of the night. And if you've ever used one of these, you know they can get a bit funky (and can be tough to clean without leaving soapy residue). I absolutely love these Bottle Bright All-Natural, Biodegradable, Chlorine and Odour-Free Water Bottle Cleaning Tablets (12 ct.) ($8) because they just go right in the bottle and work their magic overnight, then you rinse the bottle clean in the morning. No brush needed, and, more importantly, no icky smell or taste afterward either.