My 146k 04 A6 2.5tdi 163 is coming up for the big cambelt service. A couple of things I could do with advice on:

1. My local garage told me that the job requires a special tool to complete and not all garages carry it (ie. them). Is this true?
2. The car regularly loses about half a cupful of water every 400 miles. I've read water pumps are a weakness of VAG cars. Should I be worried?

thanks