Within 20 minutes, find a bucket of pig slop (a medium, wooden bucket filled with red liquid) in the districts of Freeport (e.g., Big Bend, Longshadow Alley, Scale Yard, etc}. There seems to be one bucket per district. All the buckets you need to contaminate look like a wooden bucket with two fish in them. They are found relatively close to the bells.
Within the next 20 minutes, spoil 5 buckets of fish (a small, wooden bucket filled with green fish) with the pig slop found in the districts of Freeport.