Stock up on your favorite frozen insta-dinners. We're fans of Digiorno pizzas. I made a few soups and chili to freeze, too. If you have a crockpot, look up recipes for "dump dinners", things you can prep ahead of time and just dump in, set it, and eat when its done.
Snacks you can eat one-handed, especially if you're BFing. I liked granola bars, string cheese, and pretzel sticks. Get either a reusable water bottle (and tell your partner to keep it filled for you!) or a bunch of bottled water. BFing will make you ultra thirsty!