Use the beer on him, and he’ll give you a Strange Object that can be lighted

The challenge is to see if you can drink more Airrivals Gold alcohol than he can. Accept the challenge. Then take the keg of beer on the table with the three items (the right-most one is the keg).

Speak to Manni again and say that you’re ready. You both will drink your share, Manni first and you second. Of course, you’ll lose. After Manni finishes talking, take one of the beer from the table and head to Seers’ Village

On your way towards Seers’ Village, locate the Council workman (he can be found just before you cross the bridge into Rellekka. Use the beer on him, and he’ll give you a Strange Object that can be lighted. If you have a tinderbox, do not light it yet or else it’ll explode on you.

Now, continue heading back to Seers’ Village and find an npc called Poison Salesman (he’s east of the bank). Talk to him about the Fremennik Trials. He’ll then advertise his Peter Potters Patented Party Potion, a kind of beer that does not cause drunkenness, illness, or severe headaches.

Buy a keg of beer from him for 250gps and then go to the bank and withdraw a tinderbox. Return back to Rellekka.