This guide is suitable for current RuneScape and Old School.
Talk to Pirate Pete, who is on the pier north of the Ectofuntus.
He will tell you that he is looking for an adventurer and will create a story and ask if you will help. Following that, he will hit you over the head with a bottle and you will wake up on an island. Talk to Captain Braindeath who will tell you about the zombies protesting outside his rum factory, and his plan to get their captain drunk. He will give you a Blindweed seed and ask you to grow it on the only farming patch which hasn't been destroyed by the zombies.
Head south towards the farming patches and plant the seed. After a couple of minutes it will be grown, so harvest the Blindweed and speak to Captain Braindeath. He will ask you to put the Blindweed in the hopper upstairs, so climb up the ladder and put them in the hopper to the northwest. Return back to the captain and he will ask you to bring him some stagnant water.
Go back out of the factory and make your way northwest. You will see 50% Luke guarding some gates, distract him and then head through them. Climb to the top of the mountain and use your bucket with the stagnant lake.
Return back to Captain Braindeath and he will now instruct you to fish him five sluglings and will hand you a 'tangled thing' to do so. Go back towards the farming patches and use the tangled thing to fish five sluglings. Head back to the factory and climb upstairs once more and this time use them with the pressure gauge. Pull the lever, and then tell Captain Braindeath you have completed this task and he will then give you a wrench and get you to have it blessed.
Note: Fight ahead, level 150.
Fighting the Spirit
Go into the sleeping quarters to the west and ask Davey to bless the wrench. He will also tell you that it would be useful to hang onto the wrench afterwards, as it will allow you to use less prayer potions. Once the wrench has been blessed, use it with the brewing controls in the main room. A level 80 Spirit will then appear and attack you. It is advised to use protect from melee. You can trap the spirit behind a support beam and the brewing control, thus safe-spotting the fight.
When the Spirit has been defeated, talk to Captain Braindeath and he will then ask you to get the carcass of a Fever Spider located downstairs. Make sure you are wearing slayer gloves (otherwise you will get diseased) and kill one of the spiders(level 100). Pick up their body, and then place it in the hopper on the top floor. Return back to Captain Braindeath and you will witness the 'wonder of brewing'. Speak to the Captain and then collect the swill from the output tap and give this to Captain Donnie, who is outside with the zombies. Return back to Captain Braindeath and speak with him one last time.
Congratulations! Quest Complete!
Guide Made by: DaDa
Corrections submitted by: DaDa, Dan, Dark, Dx1438, Power of Five