After so many years of neglect, water appears ready to emerge as a cutting-edge health food. But the latest version is a real head-scratcher: ionized, alkalinized water. Companies such as Chanson, Kangen, and many others are in the game to sell you a gizmo for $1,000 (or $2,000 or $3,000) to run your tap water through. The devices contain electrodes that purport to realign your water, split off some hydrogen atoms along the way, and rid it of various pesky problems so that it will taste better and be healthier and your arthritis will go away. In a week. Maybe two. And why this renewed interest in water..