The menú del día is your main meal budget tool
Most restaurants in Granada serve a three-course lunch Monday through Friday for €10–13. This includes bread, a drink (wine, beer, or water), starter, main, and dessert or coffee. It is the cheapest proper meal in any Spanish city. Eating your main meal at lunch keeps dinner costs low: a couple of drinks at tapas bars in the evening costs €5–8 total, with free food arriving with each round. A nomad eating this way spends €15–20 per day on food without much effort.