Hi Madeline - I'm afraid I couldn't find my Esterbauer guide to the Via Claudia Augusta, but I'd strongly advise you to get it. Don't be put off if you don't speak German as it's the maps that you really need, not the text. See http://www.stanfords.co.uk/Home/Prod...3850004343.htm. I've used Esterbauer guides for about 10 tours in Europe - they're really excellent.
By the way, as well as campsites they do of course list hotels, guesthouses, B&Bs etc, many of which will be very cheap but very nice in such a remote area far from big towns - and they also show where you can do your shopping. Have a great ride!