It is safe to drink the water that comes out of the public fountains. Many locals fill gallon jugs and it is their primary source of drinking water.It is delicious and quite refreshing. In fact, it taste better than most bottled water.
The digestive tonic China Massagli (http://www.massagli.com/i...) is produced at the Farmacia Massagli in Lucca. This is an eminent example of the "china" style of amaro Italian potable bitters. If you ask for an "amaro locale" at a restaurant, this is likely what you will receive.
Biadina is another local style of bitters, bottled by Massagli and other producers; this drink is often sold with a small pack of pine nuts.
Compared to Florence or Siena, there is relatively little late night activity on the streets of old Lucca. The San Colombano, on top of the walls, overlooking the train station, the Betty Blue near piazza Santa Maria, the Rewine near San Michele and the Cupido and McCulloughs, outside the walls near the station are some of the bars open late, especially in the summer.
Most locals tend to make the short trip to Viareggio on the coast, which offers a far better selection of clubs, such as 7 Apples and La Canniccia.