Who the feck is Sarah?
they're pools of water that you go up and use. Like at the beginning of the game where it mentioned a shimmering pool in the cave. You go up, hit (A) and it says HP/MP restored. There's other pools that revive, usually in towns. In Ur, there's one in Topapa's house. When you enter, go to the right to find the revive pool, and to the left is the restore pool. Usually the places that have them have a different colored roof, and there's nothing but a pool of water inside.
When going through on my emulator version, I noticed that at some point I couldn't use them anymore... This was way late in the game, and I was about to get Bahamut when my Shaman died... heh... But I pretty abused them previously... I'm pretty sure that you get a couple hundred uses of the pools before you can't anymore... And thats if it wasn't a glitch.
The project that was awesome, has fallen apart... oh well.
Keep stealing from the rust birds.