Hubby went through a phase where he grew his own fishing worms.  After buying a kit for it, it became obvious very quickly that it would have been much more economical to have done it himself from scratch!  Fortunately for me, unfortunately fo ryou, I didn't pay much attention to what he was doing, but it WAS very easy.  We even had a very old but still functioning refrigerator in which to store the entire operation, though I don't remember why that was necessary.  (It's been about 15 years or so since he did this so the memory of details has pretty much faded.)