Can BPs not like mice or rats?

[Rusky]

She may have been raised on mice and not recognize that the rats are food. You can try scenting the rat with the mouse.

What is the easiest way to do this? If I buy a live mouse I don't have any supplies to keep it alive for a week if the snake takes the rat. Or should I buy frozen mice, defrost one and rub it on the rat pup?