Italians seem to mostly drink the local water, making it a little less bad for the environment than shipping it all over the world (there are still the plastic bottles, of course). There are exceptions. I once got Pejo at a restaurant in Cattolica at full restaurant prices. They probably figured out that they could get a bigger markup with hardly any of their customers noticing. Since then, I always get suspicious when I see non-local, non-San Pellegrino, water at a restaurant.