Sacred Water is an item from Skyward Sword. It is needed to enter the Ancient Cistern, the fourth Dungeon of the game. Sacred Water can be found in the Skyview Spring near the back. Fi will set it as a Dowsing target after Faron has askes Link to get some for her. As Link heads for the water, he re-enters the Skyview Temple, fighting a trio of Stalfos in the boss room. The water is needed to heal Faron.
Fairies will swarm around Sacred Water.