This is one of the two easiest jujus to earn. All you need to do is perform two simple tasks.
First, visit Bengal Barbecue and order the “fish drink special” (it only costs 50% more than the other Adventure Trading Company tasks). You will receive a glass with a strange green liquid in which is floating red spheres. The liquid is a fish-flavored soda (imported from Japan), and the red spheres are salmon roe.
Second, find the “Intestinal Fortitude” testing cast member near the barbecue’s exit and drink the entire beverage in their presence. Half an hour later, if you have managed to keep it down, you earn your Fish juju.