There is something I found with our drinking water that makes an interesting lesson about alkalinity and pH. I tested our water and to my dismay it was slightly acid but putting only a pinch of sodium bicarbonate into a half gallon moved it powerfully to the alkaline. There is some confusion between alkalinity and pH. It seems that it is not enough to drink high pH water. Alkalinity also needs to be high for the high pH water to have a strong medical affect.
All kinds of soft drinks are very acidic, especially cola. In order to neutralize one glass of cola, it takes about 32 glasses of high pH, alkaline water. A glass of cola (with a pH of 2.5) added to 10 gallons of water with a pH of 7.4 will lower the pH of those 10 gallons to 4.6.