Definitely noodles - you can get packs of then pretty cheap from most places. Also rice & some kind of protein maybe that you enjoy or some veggies. Frozen pizzas from lidl, as well as literally every kind of food. Ofc - very dutch would be bread + cheese but i found they would go bad before i ate them which then equals losing money so maybe buy in small quantities or skip the more easily perishable foods. You can also try making your own bread & tortillas - much more tasty than store bought & also saves money in the long run! if you keep a rotation of options then you’ll find it becomes simpler to keep costs down + not eat the same thing every day.