First, use the flute and when shown the numbers of the locations, choose the 7. Now, go up one screen to the place with five totem pole-looking things. Use the flute and start dashing right before the bird picks you up. Cancel out with "B" and then you should be able to bounce off walls. Bounce off of the totem pole that is the farthest to the right and you should be swimming. There should be a water portal near you. Swim to it and go in. When you come out the other side, you should be walking on the water.
Submitted by: Agent Retera