Center of ThornTail Shop - Pay 20 - Credits
Behind BombSpore Patch in Ice Mountain - Pay 20 - Gives you Sound Test
Snowhorn Wastes - Swim to the end of the river to find the well.
Moon Mountain Pass - Plant a Moon Seed in front of the second Krazoa shrine.
Lightfoot Village - Become a member of the Lightfoot tribe. When you run across a distressed mother who says her children are underground, help her out by finding them for her. Once you get them out of the underground, she'll help you find the well.
Cape Claw - Use the Portal Device to take control of the cannon, shoot at the platforms near the starting point. Explore the holes you created to find the well.
Volcano Force Point - Take Moon Seeds back to the Temple (after snagging the third Spell Stone). Drop down next to the second gate and plant the Moon Seed, and use it to get to the well.
Ocean Force Point - Take the Portal Device to the temple (after getting the fourth Stone). Go past the elecrified floor to the portal door, through which you will find the well.