You can find a feed store, and they can almost certainly order lab block for you.
You cannot feed your mice solely on things from your home. You can go to the grocery store and make a mouse mix, but it will be more expensive than lab block.
A basic simple grocery store mouse-mix: Quick oats (50-60% of your mix), brown rice, brown or green lentils, dry whole grain pasta, pearled barley, wild bird seed, holistic dog chow.
This isn't a list of things you can give individually, it's a list of things you would have to mix together to meet the nutritional needs of your mice.
This is not cost effective for a feeder breeder, though.
But you will have to meet the nutrition needs of your mice if you expect to breed them successfully.
Mice, do not eat cheese.
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