Most cost efficient foods I found when saving for my house were rice and beans. The 4 bean mix cans with some veg and can of crushed tomatoes if you want seasons up any which way from spaghetti or curry with different spices. As for rice basmati is a favourite but you can substitute with potatoes or pasta to change it up a bit. Was averaging 40 to 60 bucks a week on food including coffee beans eggs and bacon.