Your body doesn’t let you change its pH by guzzling water. It has kidneys and lungs that work overtime to keep things steady. Drink fancy pH water? Your kidneys just pee out the extra minerals. Drink a soda (pH 2.5!)? Your body immediately buffers it with bicarbonate. You’re a walking chemistry lab, and you’re magnificent.
The real enemy of good health isn’t water pH—it’s dehydration. So drink water! Any water. Even if it’s a humble pH of 7.1. Your cells will send you a thank-you note (via osmotic pressure, but still).