Sorry missed this reply. For those still interested.
The key to keeping down costs is to buy in bulk, something I realize is not feasible to all people because it requires frontloading much of the cost. Scale according to what you can afford.
Breakfast & Dinner Example (I'm using very very generous prices, you can find most of these items for substantially cheaper via weekly sales/coupons or costco)
Breakfast:
2 Slices of Whole Wheat Bread = $0.60 ($3 for 10 slice loaf)
2 Large Eggs = $0.33 ($2 for 1 carton)
1 Tomato = $0.50
1 Banana = $0.50
Incidentals (salt, pepper, butter) = $0.10
Breakfast Total: $2.03
Dinner
Pasta = $0.33 (1 bag of pasta at WF = ~$1 and makes about three man servings)
Can of Tuna = $0.50
Frozen Veggies = $0.50 (1 bag of mixed veggies about $1.50, makes three man servings)
Canned Tomatoes = $0.50 (1 can = ~$1)
Shredded Cheese = $0.40 ($4 bag makes about 10 servings)
Olive Oil, Salt&Pepper, = $0.10
1 clove of Garlic = $0.05
Total: $2.38
Heat oil, sautee garlic, add veggies, add pre-cooked pasta, add tuna, season, add tomatoes, check-seasoning, stir-fry and reduce the water down, throw on the cheese.
Again buy in bulk and these prices go down even more. Canned goods, frozen foods, and carbs (rice & pasta are my favorites) are dirt dirt cheap.
For extra health, replace a few meals each week with fresh produce.