We are very lucky with shrimp in that they will eat a variety of foods, unlike most fish.
In terms of dry foods, there have been a few new products come onto the market which are much cheaper than ever before. For example bossaquaria's crack and snow. I think this pretty much makes producing your own dry food inefficient. I'd much rather spend time with family or shrimp than spend an hour or two making shrimp food, especially since the amount of money I could save is negligible.
However there are lots of diy foods that can be fed quickly and easily. Fruits, flowers, pollen, vegetables, ect. ect.
You'll find lots of info on these foods in threads within this subforum (Food and Nutrition).