Bro, just bring a couple of steaks in a bag of marinade, maybe a couple sausages too for variety. 3 onions, some mushrooms, then just have a fry up for dinner every night.
For lunch have, pita bread, salami cheese and butter.
For brekky have fried eggs and bacon.
For snacks just bring a bar of chocolate per day. Christmas cake is good too. Also make sure you bring plenty of oil, butter, and salt. It also really helps with weight to go with a mate and have one person carry the cooking stuff and the other carry the actual food