It depends on your requirements and budget. If you sleep in an albergue every day, it costs 10 Euros on average. But in a hostel you can get a bed for 20-25 euros per night. If you have breakfast in an albergue it costs 3 euros somewhere else it’s 5 euros. Many places offers pilgrims’ menus for lunch and dinner for 10 euros which means three courses and it’s completely filling.
You can cook for yourself which means 6-8 Euros per person. On top of this you will need coffee, drinks, other snacks for 5-10 euros per day.
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But you don’t need to bring a lot of cash with you, you can use your card in the shops and you can withdraw cash easily from many ATMs in towns.