Definately shop your cupboards, fridge and freezer first. Unless you've already hit them pretty hard you'll likely have more food than you realize.
Do you have an Aldis grocery store by you? They have good quality food (usually not organic though) for relatively cheap prices. Do you get WIC? For a family of 5 if you make less than $45,880 you can apply and you'd get food for anyone under 5.
Let's see...do you have any staples in the house?
Pancakes - 1c flour, 1tbsp sugar, 2tsp baking powder, 1/8tsp salt, 1c milk, 2tbsp veggie oil Mix dry, add wet, cook. -- virtually free maybe $2 for a bag of flour if you don't have anyFrench Toast Casserole
I don't do the whole butter, corn syrup, sugar thing in the bottom of the pan. I butter the pan put the bread in. Dump the eggs/milk over it and then lightly sprinkle some brown sugar over the top. I sometimes chop up an apple or two and sprinkle it in between the layers of bread. If you want to have sausage with it you can stretch that by chopping up a box of breakfast sausage links and scattering that in the casserole too. At Aldis a loaf of bread is $.79, we get milk & eggs from wic (otherwise they'd be about $5 and you would have left overs), a box of sausage at Aldi is $1.
Baked oatmeal -- Ends up being more like a cake instead of gushy oatmeal. A big tub of oatmeal is less than $3. Everything else is stuff you probably have on hand. http://kidsarevegantoo.blogspot.com/...d-oatmeal.html
Muffins - if you get the cheap Jiffy mixes they are usually less than $.50 a box (or make them from scratch which would be even cheaper)
Potatoes are cheap 10lbs for under $4. You could make fried potatoes, maybe a little onion, and 1 egg per person (left over from the baked french toast).
Do you have any fruit? Any family or neighbors with fruit trees? Farmer's market where you could get 2nds? Smoothies would be cheap if you could get lower cost fruit. Sometimes it's cheaper to buy frozen fruit.
Sandwiches - if you can do pb and jelly you could get 2 cheap loaves of bread for under $2 for both, a jar of pb for less than $2 and the same for jelly and have the main part of lunch for the whole week for under $6. If you skip the pb you could do an alternative butter like sunflower seeds or almonds but it would be a little more. For side dishes you could do carrots (cooked a little for the little ones). 3lb bags are usually about $2. Again some cheap in season fruit (apples/peaches) and you'd be set.
Left overs -- for you or dh's lunch, if you have enough some for the kids too
Ramen -- 12pks for less than $2, mix with veggies
Rice is cheap and you can do so many things with it. I just got a 20lb bag on sale last week for $9!
Buy one Zatarran's Jambalaya mix for about $1.50 add extra water and extra rice. I add a half of a smoked sausage rope (diced up small) so that would be about $1.50 too and a half a bag of frozen corn $.50. It will make a big dutch oven's worth and be enough for dinner and lunch the next day.
Fried rice - rice, 1/2 bag of peas & carrots or mixed veggies $.50, an egg and a little onion if you've got it, left over meat (1-2 pcs of chicken chopped up small or shredded or a left over pork chop), mix it all together with some soy sauce.
Mexican - 1/2 lb hamburger, taco seasoning (whole packet since it's also seasoning the rice), rice, can of black or pinto beans, mix all that together. Roll up in tortillas with cheese and salsa. Or eat it plain. I throw corn in it too. (If I mix the veggies in my dh will eat them, lol)
Pasta is cheap too --
Spaghetti with red sauce can be less than $3. Add a salad and you're set for under $5 total.
Twisty pasta (one box), jar of alfredo sauce (or make some even less expensively), can of diced tomatoes with green chilies, couple peices of chicken chopped up small.
Ramen noodles with hamburger and veggies.
Baked potatoes with left over meat, veggies and cheeses as toppings.
Mashed potatoes with gravy (just a little meat, lots of gravy)
I'm pretty sure you could get all that for under $75 and that's starting from not having anything in the house.