I’m not going to comment on the validity of this because when it comes down to it, who knows? (I actually personally feel better when my urine PH is not too acidic.)
Before embarking on this, I would measure your PH (both salivary and urine). You might not even need this. If you do find your PH less than awesome (urine PH seems to be a better indicator then salivary), then you can go from there.