I have another question to that topic.
If I have an idiot char, can I drink an int potion
to learn a spell or to learn how to make a tech item?
And can I use the spell or produce the item after the potion runs out?
I'm not sure if creating tech items. (I haven't tried any Tech builds btw)
But magic spells is apparently related to willpower so it's not affected by INT. Correct me if I'm wrong, but my Idiot char in this topic actually learned some spells because he has decent willpower.
However, drinking INT potion to speak better is possible (although that depends on your base INT score, of course). My previous char has 8 INT and she drank INT potion before conducting speech about statue in Ashbury. She was able to deliver excellent choices of speech by that.