Rum Deal/Quick guide

Braindeath Island

 * Recharge your prayer if you have less than 470 points.
 * Talk to Pirate Pete, north of Port Phasmatys.
 * Talk to Captain Braindeath.

Blindweed

 * Run south, climb down the wooden stair.
 * Run to the southern farming patches.
 * Rake the patch which isn't 'trashed' then plant your seed.
 * Wait for the weed to grow (less than 5 minutes).
 * Harvest the weed.
 * Return to Captain Braindeath.
 * South-east corner, climb up the ladder.
 * North-east corner, use the blindweed on the hopper.

Stagnant water

 * Return to Captain Braindeath.
 * Go down the southern stair again.
 * Run to the west coast, then north through a small gate.
 * Run north onto the big island.
 * Use your mini-map to find the water source.
 * Use your bucket on the lake.
 * Return to the captain.
 * Use the bucket on the hopper. You will need this bucket later.

Sluglings

 * Return to Captain Braindeath.
 * Run to the farming patches.
 * Catch 5 sluglings by fishing
 * Use all 5 on the pressure barrel, next to the hopper.
 * Pull the lever.
 * Return to Captain Braindeath.

Trouble Brewing

 * Enter the western room, talk to Davey.
 * Use the wrench on the brewing control.
 * Kill the evil spirit.
 * Return to Captain Braindeath.
 * Climb down the nearest ladder.
 * Equip your slayer gloves (Not required if you have high lifepoints).
 * Kill a spider and take its body.
 * Use it on the hopper.
 * Return to Captain Braindeath.
 * Turn the output tap (south of the machinery).

Finishing up

 * Talk to Cpt. Donnie, north of the farming patches.
 * Return to Captain Braindeath.
 * Quest complete!