Metal Bucket is also seen in Depths of Despair. Similarly an item called Filthy Bucket can be found in canon games. You can find it here.
Depths of Despair Nightmare Edition
Classroom 4-A (CPD2)
Female Bathroom (CPD2re)
Used on the shower (CPD2)
Used on the puddle of green ooze (CPD2re)
Glass Bucket is an item that appears in Chapter 1 of and it's Corpse Party D2: Depths of Despair remake.
Corpse Party D2: Depths of Despair
Spoilers for Spoiler Warning!: Corpse Party D2: Depths of Despair follow
Ayumi finds the Glass Bucket inside classroom 4-A and uses on the shower within the girls' locker room to collect the "burning" blood. After that the item changes to Acidic Blood.
Corpse Party D2: Depths of Despair - Nightmare Edition -
Spoilers for Spoiler Warning!: Corpse Party D2: Depths of Despair - Nightmare Edition - follow
Chapter 1: Return to the Nightmare
In the remake, Ayumi finds the bucket inside the female bathroom. After picking it up, you first need to enter classroom 2-3 after using the
rusty key. The ghost will ask you to fill the bucket and after filling it with the green ooze, the item becomes Acidic Ooze.
Significant plot details end here.