it is not recommended by the fasting masters to read fasting books *while* fasting.
They advise reading them before, then closing them, and going within. There are sound reasons for this. To discover them for yourselves (which is the best way to prepare for the water fast), read Shelton, Purinton (my current reverently irreverent favourite)and whomever else turns up. Check Chrisb1's list of posts for the Shelton links, and Mouseclick's for some lovely Purinton links. There's a wealth of reading--but really. Read before you fast.