When in high school I read somewhere that each night sleeping in a tent does not count against your time on earth. It must work. I have tent camped A LOT in my life and am now very old. I have a lot of great backpacking tents. So on our first Camino, the del Norte, my family and I carried tents. We passed one commercial camp ground I would have liked to stay in but it was too early in the day. We mailed our tents home from Gijon, 500 km of carrying an extra kg. I never saw a single suitable "wild" campsite in two walkings of the del Norte and understand it is illegal to "wild" camp anywhere in Spain. Aside from that, water might not be anywhere near a suitable "wild" tent site. Some private albergues allow tent pitching on their grounds if they have room. Presumably at a reduced rate. The campground near Playa Frances rents small cabins very reasonably but is off the Camino. I have slept in a tent (their tent) at the municipal albergue at Castro Urdiales. This tenting at a private albergue would provide the shared camaraderie so beautiful about any Camino. And you will be highly appreciative of an evening hot shower and toilet facilities. Buen Camino