It means water in Japanese, and its also a company that two rad dudes in the sno-shred industry started. They make Stainless Steel Water bottles so you dont have to add to the mess of plastic island. The best part is, they are dual purpose! They make great gas cans for all you trendy kids out there(me) that run small tanks on your bike. A Mizu bottle will get you an extra 10-15 miles if you run out of Petrol in the middle of nowhere. Go cop some here, be one with your inner hippiness.