The Legend of Zelda: Ocarina of Time/Fairy Fountains

Fairy Fountains
Probably one of the most beneficial aspects of this game, are the fairy fountains.

Death Mountain Fairy Fountain
The first, and easiest to get-to Fairy Fountain is the one on Death Mountain. You will need the Hylian Shield (or a lot of hearts) to get to it, considering rocks will be falling on you. You will also need the bomb bracelet, or your own set of bombs.

Now that you know what you need, the process to get there is really easy. You simply climb the mountain until you get to the flagpole sticking out of the ground. From there, you turn left, and head up to the step look-alikes. You will have to throw either Flower Bombs (which should be close by), or your own from the Bomb Pouch you get in Dodongo's Cavern. Blue up the boulders with the bombs, then proceed up the Mountain. When you get to the very top, go through the left hole (which may require another bomb to open), and vuala!