Water Bottle

From the Super Mario Wiki

Water Bottles are used to fill up the FLUDD with water in Super Mario Sunshine. They are only found in Isle Delfino. These are very useful when there are no bodies of water nearby, and are seldom dropped by enemies. They disappear almost immediately, however.

Water Bottles come in two sizes. Small ones refill half of FLUDD's water tank, while big ones refill FLUDD completely. Big water bottles have a Pianta label and small bottles have a Noki label.