I'm too depressed most of the time to leave the house. When I do I shop for a week's worth of groceries since I usually only work up the courage and energy to leave the house once a week.
The only thing I really cook is soup in a slow cooker. I recommend a slow cooker to everyone. You can make big batches and portion them for the freezer.
My heart goes out to everyone here who is too tired or depressed to cook and shop. I know exactly how you feel.