I hope that's a joke answer... anything cooked is a no go....
You want whole prey items, bones, organs and all.
you can usually get whole fish in bait stores sometimes in grocery stores. If you buy whole chicken they usually have the packet of organs inside but that's only some of the organs and it would be more nutritious to have all of them plus beak feathers etc. Muscle meat alone will be unhealthy in the long run so try to find a stable source of whole prey. Rodent pro and a number of other companies breed more than just rats and mice or rabbits and guinea pigs, they also have chickens and quail of various ages and sizes. a good mix of all of those would be best.