After locating the Gerudo Mesa and Cave of Ordeals in the Gerudo desert, you are able to unlock fairies and later Great Fairies at each spring around Hyrule. Smaller fairies can be bottled, restore 8 hearts when used, or when you run out of hearts. Great Fairies will give you a bottle full of Great Fairy Tears, which heal you full and temporarily boost your attack, provided you have an empty bottle and no Tears in your inventory already.