First, we need spoon. Here’s the link on how to get.

Second, get blundergat. Then, upgrade it to acidgat or magmagat.

Third, get tomahawk. Here’s the link.

Fourth, go to infirmary and place your spoon on the bath tub. This is almost the same as how the BO2 mob of the dead works.

Fifth, go to the roof and kill zombies for about 20 to 30 using magmagat or acidgat.

Sixth, go back to your tub and press action button to drain the blood that you collected.

Seventh, go to catwalk and on the middle of the hall you will see a water tank. Throw your tomahawk to get your upgraded spoon. If you cannot get the spoon then, you had to put the tank down but shooting the feet support. Check the video below for the exact bracket locations. Thats it you can now easy get your upgraded spoon.