Summarize:

Move around the site and look for red bone piles, which are similar to the gray bone piles you dug up, but this time the piles have turned red due to your Zombie Blood mode. Use the Golden Shovel to dig, and you'll get an empty Perk-a-Cola bottle. These are located at different locations of the map. The Wunderfizz looks like gateway machine with a big sphere-shaped object mounted on its top part. You can only fill the bottle up with perks from the Wunderfizz vending machine. Continue searching red bone piles for empty Perk-a-Cola bottles and filling the bottles up with perks at the Wunderfizz vending machine until you get these 8 perks, listed below: Deadshot Daiquiri Electric Cherry Jugger-Nog Mule Kick PhD Flopper Quick Revive Speed Cola Stamin-Up
Search for red bone piles. Dig the red bone piles. Find a Wunderfizz vending machine. Fill up your empty Perk-a-Cola bottle with a perk. Repeat.