The bucket is essential for much of the game. It can be upgraded to a Golden Bucket by using the Skull of Nan Sapwe's "mesmerize" attack on the vines underneath Lab B to uncover where the player can plant the bucket. Note that the player must have mesmerized the poster in the purple water room first and have planted one of each type of plant already for the vines to disappear. Then a seed location will appear, and the player can plant the bucket in it. Three more seed locations will also appear in the area and one must plant a seed at each location. Zombie attracting purple plants will quickly grow, and the player must feed the purple plants until they are full. This takes a few rounds' worth of zombies. Then everyone in the party can get a golden bucket. The Golden Bucket never runs out of whichever water is inside it.
A total of four buckets can be found in the map in the following locations:
In the spawn area.
Inside Lab B.
Inside Lab A.
Around Lab B or Lab A near the blue and green water ponds.