This article, Grocery-flyer gourmets over at The Globe and Mail , asks: can you cook for two on $8 (or 1 for $4..or…well, you can do the math). It takes some work, and likely buying in bulk would help, but you can make good low cost meals cheaply. In fact, they have a game they illustrate to make it somewhat fun to do. I might give it a try.
I think to make it easier, stocking up on rice, beans, onions, potatoes, carrots, even other root vegetables like turnips and parsnips, would go along way to driving down the cost. So would having your own supply of tomatoes bottled. Even better, having your own herbs.
Another way to save? Eat less. Certainly eat less processed food. And drink more water.