You can offer again in five days. I would put the mouse away, give him a bowl of water, and feed him scraps of food. Mice and rats will eat just about anything you give them. They may tip over water bowls or get stuff in them, so they will have to be cleaned more, but it can still be used. Then you wouldn't have to put out any more money.
Unless the mouse is half the size of his normal meal, I wouldn't double up on feed. Just wait it out for the five days and offer him again. Usually at five days they are ready to eat again, some babies will even eat again after four.
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