The “alkaline” in alkaline water refers to its pH level. The pH level is a number that measures how acidic or alkaline a substance is on a scale of 0-14. For example, something with a pH of 1 would be very acidic, and something with a pH of 13 would be very alkaline. Alkaline water has a higher pH level than regular drinking water. Because of this, some advocates of alkaline water believe it can neutralize the acid in your body. Normal drinking water is generally a neutral pH of 7. Alkaline water generally has a pH of 8 or 9.