Buy a whole chicken. Roast the chicken. Cut the chicken into bits. Stick the chicken carcass in a big pot with water, chicken stock (cubes or whatever you want), and an assortment of vegetables. Leave for a few hours. The good thing about roasts and stews is that there is about 15 minutes prep time, and then the rest you can just leave on a timer and do your own thing.

Return and remove all the bones. You can freeze the stew and it'll last you at least a fortnight. The chicken meat itself will last a few days, depending on how much you eat. This is food for half a month and it costs next to nothing.