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Water Barrels are items in Kid Icarus and Kid Icarus: Of Myths and Monsters. They allow Pit to store up to eight bottles of Water of Life, when normally he can only carry one bottle. He can't carry more than one barrel, however.
Pit can buy the Water Barrel for 350 Hearts. Pit can also find a Water Barrel in Treasure Chambers as one of the randomly dropped items for outsmarting the God of Poverty. If Pit already has a Water Barrel and the God of Poverty drops one, Pit can't pick it up.