Druthers - origin.
When you look at the meaning of the phrase "If I had my druthers" it gives the meaning but not the origin.
Doesn't druthers come from "I'd rather" so "having your druthers" is having your "I'd rather...."'s.
Is that right?
Yes. According to Merriam-Webster online:
Main Entry: druth·ers
Pronunciation: 'dr&-[th]&rz
Function: noun plural
Etymology: druther, alteration of "would rather"
dialect : free choice : PREFERENCE -- used especially in the phrase if one had one's druthers