I haven't used these, and they're not *exactly* MREs, but this looks useful:
http://www.costco.com/Browse/Product.aspx?Prodid=11219554&whse=BC&topnav=&browse=&lang=en-US&s=1
This does not include a heat source, so STERNO, etc., is needed. Having been through IKE this year, I'm thinking a bucket of those in the hall closet might be pretty doggone handy. And, supplemented with cans of tuna, beef jerkey, etc., it might work out.
After IKE, we had 2 kinds of MREs around here. One was what I called civillian. The box said "Packed exclusively for Crowne Point Ltd." and in each clear, plastic package was a pack of beef stew, a military-style cracker w/ PB&J, a drink mix powder, and a dessert - usually a Fruit & Fiber bar. The stew is OK - really thick - but it will keep you from starving. Both pieces of beef in each package taste like beef...more gravy than anything.
The other box I received was military-style. It's buried in the garage right now and I can't read the box. The labeling lead me to believe it could be genuine USMilitary issue. Each MRE is wrapped in heavy brown plastic wrap and each MRE was a different meal. Most are rather medicine/chemical tasting. If you can power it down, I think these are more filling. I cannot recommend the "milkshake" though...[shudder]...
Neither gave me digestive problems, either binding or loosening.
Q