How much is a glass??
Why not a cup, a dram, a snifter, a liter, a carton, a bottle, a thermos????
this article is a bunch of horse excrement and is the same snake oil that has been put out by con artists for hundreds of years.
The water in your body is a very high concentration of sodium, magnesium, and potassium. When you drink tap water your body must leech minerals from the blood to make it the same before it can be used. If you can tolerate sodium, a pinch of table salt will help speed this absorption. The pinch should be small enough that you cannot taste it.
If you want to read real water chemistry read the stuff here. You can even read why EZ water is a scam.
http://www.chem1.com/CQ/