There is this notion that "make available" this or that means that you lose it upon completing the quest. Has this been properly tested, though? Because I seem to recall having the same reservations myself, but upon testing found that I didn't actually lose anything, that if a quest requires you to "make available", say, 200 bread, it simply means you have to have that much bread in storage. As I see it it's a variant of "raise your stock of X by...", except you are free to choose how you fill your stores. So I don't think you're giving anything away, unless it takes a long time for the stock to be removed.
Similarly, I've gotten the quest to train a few soldiers a couple of times. What I then do is I simply take the required number of soldiers out of one of my armies, finish the quest, and then put them back in. I don't lose them.
Is there someone who has positive knowledge that they've lost the resources they needed to "make available"? What do the devs say?