I agree with Bill and can vouge for the vac seal reheat that Larry W. layed out for me. Worked like a charm.
Fill a big pot with cold water, put the cold meat in (from fridge or freezer), and bring to a light simmer. Shut your burners off and cover the pot. Just let it sit in there for 20 - 30 minutes.
Mine came out exactly the same as when I sealed the bags. I spritzed it down with apple juice before cooling / sealing and I didn't need to add any more moisture on the reheat.
Todd