How would I say, for example, "I couldn't find any food"?
Stack Exchange network consists of 181 Q&A communities including Stack Overflow, the largest, most trusted online community for developers to learn, share their knowledge, and build their careers.Visit Stack Exchange
French Language Stack Exchange is a question and answer site for students, teachers, and linguists wanting to discuss the finer points of the French language. It only takes a minute to sign up.Sign up to join this community
If you want to sound formal, I'm thinking of
Je n'ai pas trouvé la moindre nourriture
Je n'en ai pas le moindre doute
If you want to sound casual, like anyone in France (because the above answer if very fancy), you should go for :
Je n'ai pas trouvé de nourriture.
Just put nothing. I don't feel like this is any different from the affirmative form.