Add the tomatoes and let it simmer. You might want to divide your food stamps into a weekly allotment and do frequent shopping. You'll be able to keep fresh vegetables, cheaper and better for you, around longer in the month. And it won't go bad in your fridge. You end up buying individual cans of tomato juice, small cups of cottage cheese, and prepared sandwiches.
Money runs out pretty fast.
Here are some essentials and ideas to keep a 'portable kitchen'. P-38 style military can openers are a must. They are 40 cents a piece, attach to a key chain, and are lighter than a key. DO NOT store food in plastic grocery bags. A small investment in a one-burner camper's stove is the best bet, because you can cook anywhere, be completely hidden if you only had one bush to crawl behind, and it fits in the smallest of backpacks or bags.