Hi
I am also planning on wild camping for most of my pilgrimage from Lourdes to Santiago de Compostela (via Saint-Jean-Pied-de-Port) next year. I will be setting off approx 11th March 2011 to arrive in Compostelle for Easter 2011 (a Lentern pilgrimage).
A lot has been made of camping (wild or otherwise) in the forums though not much of it too useful. A lot of opinions without too much experience it seems. I have wild camped in many places for many years and will use my upcoming pilgrimage trek next year to offer my experiences to future pilgrims. Maybe you can do the same bisaccia?
If you wild camp just make sure you leave the place you pitch your tent in the same condition as you find it. Unless you find you can camp in Albergues and Refugios grounds, church grounds etc (ask first!) then camp away from the road, away from buildings, away from farm animals, in fact find an isolated spot where you cannot be seen or cause any disturbance. Leave no waste, start no fires, bury your excrement deep away from water or take it with you to dispose of later. If you find waste there already be prepared to remove it as it were your own. Wild camping is a privilage not a right and most land owners are happy to let you wild camp as long as they don't know you have!
As for water - as long as you boil any water from rivers, streams etc for 2-5 minutes then it will be safe to drink (once cooled of course - unless for a hot drink or to rehydrate food) and any Albergue or Refugio worth it's title will let you have water even if you are not staying there.
A lot is mentioned in the forums of the spirit of friendship when staying in Albergues and Refugios and although this is highly desirable for those who wish their Camino to be a shared experience, for others this is not the reason they walk it. We all have different reasons for making a pilgrimage and all should be respected. I am going for very private reasons and although i will enjoy meeting people along the way as i walk, i require my solitude in the evenings. I am not anti-social, but as i mentioned we all pilgrimage for different reasons.
A lot is also discussed about the cost per day of walking these Camino's. A lot of people can not manage on less that 25-30 Euro a day. Having read their daily intake of breakfast, dinner, supper, beer, wine, plasters, lotions and potions, coffee stops, pastries, snacks, accomadation requirements, taxi's, bus fairs etc i can see why they need so much money! I wild camped in Scotland last year for 5 weeks and spent less than 3 euros a day!
Some treat the Camino as a holiday, others as a task, others as a way to meet people, others as a true pilgrimage.... etc etc. Your financial requirements will be based on what YOU want/expect from your own camino.
Good luck, enjoy and panic not. If all people are as nice on the road as they appear in the forums then there will be plenty of help, advice, support and love for you on your journey.