That Fool's Stout worked great! I placed a bet on the next race, and... let's hope the crew you got drunk did a number on their car! There's only one more task for you -- take this note back to Crank Fizzlebub in Booty Bay. He'll want to know of the successful test. And hopefully we can get more of that Fool's Stout for future races!
It says here that the fool's stout was a success. That's good news! If you ever want more of the stuff, then let me know and I'll have you gather more of Zanzil's Mixture.