Bed - 5 to 30 euros depending on if your place is donativo or private
Breakfast - 3 to 10 euros depending on if you have bread and coffee or fresh squeezed juice and tortilla and ??
Lunch - 2 to 10 euros depending on if you picnic or buy the Menu del Dia which ranges from 5-10 euros depending on where you are
Dinner - 2 to 14 euros depending on if you picnic or buy the Menu del Peregrino which again ranges depending on where you are
Coffee can be from 1 to 2 euros
Fresh juice from 2-4 euros
Washing clothes from free if you handwash to 6-8 euros if the clothes are washed and dried for you by hospitalera
I budget 20 euros per day.
I eat well
I wash my own clothes most of the time
I eat my main meal at midday, taking advantage of the Menu del Dia which is an excellent meal at a lower cost than the Pilgrim Menu
I picnic most breakfast and dinner meals, buying my food along the way in the tiny tiendas
I have a coffee each morning at a bar and the occasional fresh juice when I find it
I have several blog posts about what is available as far as eating. Here is the one on lunch.
You can find breakfast and dinner posts on the sidebar.
http://caminosantiago2.blogspot.com/2011/08/lunch-on-camino-santiago.html