RO DI, light reading or "what the hell go shopping" anyone???

Man did I score for Christmas! I got an RO/DI unit for my water from my fish, the new book from Julian Sprung and Charles Delbeek The Reef Aquarium Volume 3 Science, Art, and Technology of which I am reading page for page from my Dad, gift certificates to my favorite LFS Safari and Hillside from Santa and Rick and Jen....WHEW I have some serious shopping to do! WHEHEW!