A Watery Grave
1: You can find this first water tank in the Pool Room at the end of the first hall.
2: You can find this water tank in the Laundry Room across from the hiding ghost girl on the first floor.
3: Just before you go up the stairs to the second floor, you can find this to the left of the stairs.
4: On the second floor, look in the closet of apartment 2A where the people are playing cards to find this tank.
5: In apartment 3B on the third floor where the two man party is going on, look for this tank in the corner of the room.
6: Go to the fourth floor and go all the way to the end of the first hall to find this in the corner.
7: When you are in the crime scene apartment, go to the washroom to find this tank.