you have to find potion recepy in library . each potion is specific to a character with couple potions for each character. when youre brewing lookout for highlited words such as "heat,cool,stir,grind" you have to follow the recepy as it goes , sometimes it has a bit complicated ways of brewing but its just about reading troughly. heres couple of tips 1.recepy follows the words from left to right, for example if you have grind as your fist option and somesing like copper as the first material i bet youd have to grind copper for your recepy and etc. 2. read really throughly some actions are required to happen after, before or later in the recepy .3. if its too hard for you find a whole recepy ansver somewhere on a guide for aHITR.