I don't know if you get it, restaurants and places like that (that order coke in bulk) don't get houndreds of 2L bottles, they get a syrup that they mix with something, probably just water and it makes coke, thats why at places like mcdonalds/pizza hut the coke isn't as nice as when it's out of a bottle that's been chilled n such.
but yeah, he's trying to say that it's that acidic (pH2 was it? - V. acidic) can't be at all good for you...
waters neutral, (pH 7) n coke syrups pH2 so if i'm right your drinking some pH5 which is still quite acidic, not good for ya really.
(i'm probably wrong, not good at science)