Breed a tropical fish called a Danio. The zebra danio you can get from walmart for .78 each. These tolerate out door temps during summer in most of the country. I raised them/bred them outside when I was a kid in WA state on the peninsula.

They breed like crazy. You will have thousands in a few months. Feed those young with they are about 3/4 inch to the crappie......when you add minnows to feed crappie, add your other food too. Eventually they will convert to pellet that way. I have done this with bass and catfish.

However, live food will always be far superior in feeding than pellet or commercial feed.