You might want to consider services such as HelloFresh. They're more expensive than buying the individual items at the supermarket, but cheaper than eating out.

You might want to consider services such as HelloFresh. They're more expensive than buying the individual items at the supermarket, but cheaper than eating out. But the best thing is there's no food waste, and they sell you items meant for just one person - so your grocery bill would remain roughly the same (just with less food waste).