Fill your bucket or jug with water and use it with the clay in game

Wizard Mind Bomb: Buy this boi gold from The Rising Sun bar in Falador from Barmaid. Once you’ve killed the Lesser Demon, use the key on the north door and open the chest to acquire the second map piece.

Cru-station Cage: Get this lobster pot at any fishing store.

Unfired Bowl: To make this, acquire some clay and a bucket or jug. Fill your bucket or jug with water and use it with the clay. Heat your soft clay in a pottery oven and choose to make an unfired bowl.

Sheet of Silk: Buy this from the silk maker in Al-Kharid.

Enter the door when you’re ready. Kill the dragon. You’ll be teleport out of the chamber after you defeat it (note that you can’t enter the chamber ever again after you complete this quest). Quest is now complete.

Now that you have 2 of the map pieces, head to south Port Sarim and enter the jail. Use magic or long range equipments to kill Worm brain the goblin. Activate telekinetic grabto acquire the third piece of the map. Combine all three map pieces to get one large map.

Hand Harold the Asgarnian Ale. Then ask where he was when he last had the combination. He’ll tell you that he doesn’t remember.