Save your money and recycle some plastic beverage bottles. Look for ones with wide mouths and reasonable capacity - typically about one liter or so. My favorite is Gatorade - as light and cheaper than any commercial product, and no heartburn when it goes by-by.<br><br>Plastic bottles are bulky when empty, which may be consideration. If you must have no bulk, light weight, and don't mind the money, get Platypus water bottles -- about $6 for a liter cotnainer.