I think the gardening suggestion is extremely oversimplified also. Sure you can turn over a shovelful of dirt and throw in some seeds, but if you really want to get a good yielding garden you have to put more effort into than that.
His food expense is way out of line for one person, unless he regularly shops at a high end market. If you demand for yourself only the very best of groceries, like expensive imported beef and expensive organic products, for example, you are going to have a high grocery bill.
Home canning takes alot of work, requires special, though not necessarily expensive equipment, and the room to store the canned food and the equipment when it is not being used. Pressure canners are large and don't always fit on a stove. My stove would not accomodate one because it has a microwave attached above. If you can get a good yield from a home garden or can find good produce cheap enough, and you enjoy spending your spare time in the kitchen, then canning is a good endeavor.
Edey's Vintage and Current Needlework Blog
Life is like a quilt - it is made beautiful from all the little pieces stitched together.
Use a HandCranked tool, it doesn't need to be plugged in or charged up!
Treadle sewing machines. Get a workout and save electricity all at the same time. Plus it can go anywhere, even outdoors!
READ THE ARCHIVES! It'll do you good.