Green Potion

Green Potions are a common item in every Zelda game with magic, the item is like a portable Magic Jar, the liquid is stored in a bottle and when drank replenishes the magic bar.

A Link to the Past
A Link to the Past is when Green Potions first debuted as "Magic Potion"

Ocarina of Time
Green Potions survived the jump to 3D in Ocarina of Time and were obtainable in the Potion Shop.

Majora's Mask
Majora's Mask also featured the Green Potion in Koume's Potion Shop.

The Wind Waker
Green Potions are a product of Green Chu Jelly and can only be bought after 15 drops of Green Chu Jelly are brought to the Chu Scientist.

Twilight Princess
Twilight Princess in it's final version features no Magic Bar and thus no Green Potion, however, it once did and the remnants are left over in the Game's memory, the item "Magic Potion" exists and was originally meant to recover Magic.