Here is a great non-commercial injection...
Johnny's Au Jus concentrate, mixed a little lighter than the directions. You can usually get it at Wal-Mart.
Minor's is great as well, if you can find it. What makes Minor's better, as far as mimicking a commercial injection, is that it contains sodium phosphate, which is one of the "magic ingredients" of many (if not all) commercial injections.
John
