Frozen or reheated milk can change taste as a pp has said. It has something to do with the fact in the milk changing.
As for reusing it, what I found when researching it (first child I pumped for and did not eat from breast) you cant. The information I went from is it's good at room temp for up to four hours (depends slightly on room temp). But once used it should be only good for 1 hour. This is because baby has now mix salvia with it if only slightly and bacteria could start growing. But depending on your state there may be rules regarding usage.

I would just measure out small amounts of only a couple ounces at a time.

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