I hate wasting food. I don't mind paying for certain conveniences, like ready to serve salad greens, but I do enjoy cooking for my family and I like finding ways to save money on our grocery bill. There are great websites out there that are designed to give you ideas on meal planning and the grocery order to go with the weekly menu. They focus on fresh fruit and vegetables in season, items that may be on sale in the supermarket and stretching your food dollar.
Everyone in my family knows that when I roast a chicken for Sunday dinner, they can expect chicken salad sandwiches for lunch the next day and homemade chicken soup (made in the crockpot) the day after that. If there is more leftover chicken, it's made into a casserole and goes into the freezer for those times when I've got a cluster of night shifts to get through and need to sleep more than I need to cook.
I'm teaching my kids to cook their favorite foods so that they're healthier choices than similar fare at a fast food place. They love cooking stews, chili and spaghetti sauce - and they know how to cook them using both the stove top method and the crockpot.
Years ago, we were given a bread making machine, and we use that for making dinner rolls, pizza dough, and sometimes even a loaf of bread! It's another convenience gadget that my kids enjoy using to help make a nice meal.
I find that cooking this way and stretching one meal into three or four meals has shifted my spending at the grocery store so that I've got more money to buy fresh fruit and vegetables.
We also have a small vegetable garden every summer - you just can't put a price on the lessons kids learn from planting a few seeds, tending them and watching them grow over several weeks until they are ready to eat. I think it makes them more aware of how valuable produce is in the supermarket when it isn't in season. We also keep a composter for fruit and vegetable recycling - all our peelings, wilted greens, egg shells and coffee grounds go in, along with raked leaves and grass cuttings. It teaches them ecological responsibility, and it doesn't take any longer than dumping everything in the same garbage bin.