Even better for someone living on their own is to cook for, say, two or four, something than can easily be frozen in portions. Eat one tonight, then freeze the rest as separate portions so you have easy meals for some time in the next three months. Not only is this economical but it also enables you to use lots of vegetable ingredients – healthy and tasty – which can be very tricky if you're trying to adapt a recipe for a single serving.
I wrote a book about this, which also included recipes that could form the basis of two different dishes – one for now and one for making later. I feel certain that I have a copy somewhere in my office but can't lay my hands on it and cannot remember what on earth it was called. It's probably out of print now anyway.