Cleaning herbs to 82, then special recovers until 83, super antifire until 84, then 3k each of extreme attack, strength, defence, and ranged (1k of magic). Don't decant the first 1k of each potion, because you will turn those into overloads. (that's for ~92 herblore with a life's supply of potions) I'd start with the first bit, that is, spec recovers (at 82, with mature ale) > super antifire (83, ale again) > extreme attack (+4 stew) > extreme strength (+4/+5 stew) > extreme defence (+5 stew). Assuming you want to make full extreme sets (690 xp each) and you'll be making them from level 84 to 86, you need about 850 sets.