I'm in the first temple of Skyward Sword. I've defeated the first hanging skulltula there, how do I make it across the water to reach the other one and get the treasure chest?
If you are at the part I am thinking of, you do not face the second skulltula yet. Turn to your left, and there will be a crystal switch that you must hit with your slingshot. This will cause the water level to rise, which will lead a path to the dungeon map. Once you have the map and return to this room, that is when you will be able to face and kill the second skulltula.