The short answer is yes. Drinking water from the tap in Italy is considered safe.
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As far as drinks go, connoisseurs will enjoy delicious spring water flowing from village fountains during walks unless labelled 'non potabile' (tap water is always safe to drink).
In Italy, don't shock your waiter by asking for tap waterNot so, as you should never ask for free tap water in restaurants. As Fodors explains, usually, you'll be offered a bottle of still (naturaleor liscia) or sparkling (frizzante or gassata).
Some guides advise bringing one with you from home. But plastic water bottles work just as well, and they're sold in every cafe in Italy. Buy one when you're here and just keep refilling it at the fountains you'll see everywhere.
If you ask locals “Do you tip in Italy?”, they'll explain that while they sometimes leave a small tip, it's generally not necessary. In Italy, gratuity (or una mancia, pronounced oo-nah MAN-chah) is considered a bonus for exceptional service. And it's not often that you'll find a tip jar at a register.