Water Bombs are items from The Legend of Zelda: Twilight Princess. This specialty bomb retains all of the functionality of the regular Bomb with the added ability of underwater usage. Bomb Fish appear to be the inspiration for the bombs, as they explode if Link hits them with his sword and are similar in appearance. Water Bombs are needed in order to enter the Lakebed Temple.
Water Bombs can be purchased from Barnes in Kakariko Village after Link receives a letter from Barnes regarding a new type of bomb. Only fifteen can fit in one of Link's Bomb Bags. Water Bombs can also be combined with the Hero's Bow to create Bomb Arrows that explode upon contact.