Are you walking near the Roman Forum or the Colosseo or somewhere in the World?
You need water?
Just locate you in the map and look around to find a free drinking fountain.
But if your are in Rome and the battery is down just buy the book "I Nasoni di Roma" by Fabrizio DiMauro - Editrice Innocenti
Bug Update for new list and IOS 8.3 ready
Up to six family members will be able to use this app with Family Sharing enabled.