I heard that Rome had a water shortage and the fountains no longer had water. Any news on Trevi Fountain?
Yes, there was a water shortage last summer. That was then. Trevi fountain is, um, fountaining as usual. Piazza Navona, too.
Other than a couple at the Vatican, they didn't shut off the fountains last year during the severe drought/heat wave.
https://community.ricksteves.com/travel-forum/italy/any-update-on-the-drought-and-heat-in-italy