Step 1...gather your fixins....anything that can be eaten either raw or cooked, using ONLY water...nothing requiring refrigeration or milk, butter, etc...

*packaged snack crackers....PB on wheat, cheezy, etc., etc...
*bagged/canned tuna, chicken, spam, sardines....whatever meat you prefer....
*packaged instant rice and potatoes...
*instant drink mixes...coffee, crystal light, whatever.....
*tea bags....
*bullion cubes.....
*ramen noodles...
*single servings of salt, pepper, sweetener, or whatever your taste....
*granola/cereal bars...
*candy bars...
*instant oatmeal packets....

Step 2.....Dig through your stockpile and arrange the types of meals you want to package...remember to diversify if you don't want the same, boring meal every time you crack one open...

Step 3...Break out the vacu-suck and shrink-wrap your goodies into nice li'l packs....rinse and repeat....*NOTE...don't forget to pierce your packs of rice, potatoes, noodles, and crackers w/a thumbtack or something, or they'll bloat under vacuum and cause your MREs to be bulky....piercing won't harm the contents, as you're delivering them to a vacuum state, and contamination is not a factor........

Choose your foods wisely and you should end up w/a 3-5 yr. shelf life, when properly stored. The line of DIY MREs above cost me about 2 hrs and $75 to make....compare that to a sh*tty tasting, $6 per commercial MRE with a comparable shelf-life, and you figure the savings....