Don't know if any of this has been posted before, but MREinfo.com has a bunch of good detailed information on US military rations and the sort of major NATO players (UK, Germany, etc) and some minor ones.
They also have a discussion forum for collectors which has information on rations...
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Military Ration Information
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"Rations" in the late Twilight War
I think that MREs and other prepared combat rations would be running out (if not long gone already) by 2000. After the TDM, I don't think production of MREs could continue and, even if it did, distribution of said would be difficult.
Instead, I think you'd see a return to the way armies...