Could it be that your pH is normal because you are possibly the healthiest you have ever been? As your body gets ever closer to that ideal balance it will be able to make subtle adjustments to your blood pH without compromising other systems (thus affecting saliva and urine). General good health and reaching homeostasis will allow occasional "cheats" without throwing the body into chaos. As I said before-balance is the key. Once you have that no supplements or drugs are necessary.