I'd comment on it to Italians, every time I saw it, puzzled and delighted. "But surely, if you translate that out of impressive-phrase-on-the-side-of-the-bottle-language it means if you drink this water you will pee?" I said.
And they agreed that it did in fact mean that, and said that the Italians liked the fact it seemed to be conferring medical benefits and possible weight loss.
I think that they should go further, and put a note on the side of bottles of Italian mineral water indicating the failure to ingest such water, from those bottles or in any related form, will undoubtedly result in dehydration and inevitable death. I bet they'd clean up.