Forest Water

From Zelda Wiki.org

Forest Water is the mystical water in Forest Haven in the popular game The Legend of Zelda: The Wind Waker. The water, once outside Forest Haven's borders, turns into regular water in 20 minutes. The water is said to be the only thing making Forest Haven, the Koroks, and the Great Deku Tree stay alive and prosperous.

The Korok Tree Challenge

The Koroks need your help. The trees they planted for their annual Korok Ceremony are withered and dying. The only thing that can heal them to health is the mystical forest water. Get a bottle and go to Forest Haven. Scoop up some water and run. Ounce your outside the 20 minute count down begins. On your map you'll see what look like faint leaves, those are the locations of the trees. Get to them as fast as you can and pour the water on them. Get to them all before your 20 minutes are up.

With the Hookshot and the grown trees, Link can access even more areas and challenges.