My homemade mix is: 1/4cup each of chicken layer mash, 1/4cup Black Kow, 1/4cup coffee grounds, I add also 1Tbs sugar and 1tps ground oyster shells. I put all this in a small food processor and turn it into a powder.
I lightly sprinkle some on top of the bed until it's all gone, usually takes about a day to eat all of it.