Going to have to go a little off the rails with the answer, but Wine of Zamorak. Purely for the nostalgia of watching people burn themselves on it back in the day
I would have to go with the classic stamina and agility potions. I don’t think I’ve ever used a brew in my life. As I progress my account towards the mid-endgame I look forward to using the highly ranked potions from this episode more regularly. I’ll store the info for later.
putting combat potions below strength and attack potions is insane. costs basically the same as both but saves an entire inventory slot for each potion
unicorn horns - kill cows at ectophial tele or outside the crafting guild with the bank unlocked, kill unicows at tower of life with diary for noted unicorn horn drops.