how to : alphabeth rule???

Hi,

I'd like to generate a rule that replaces all letters by the next letter in the latin alphabeth.

I want a=>b ; b=>c ; c=>d .... etc.....
Can I make just one rule in wich every letter of a word in a dictionary is shifted to the next in the alphabeth
example:

my password is "vzsdq"
it was derived from the word "water"

I know how to replace one letter or character (sab,sbc...), but I don't know how to shift them all at the same time in one line.

Am I talking nonsense, or is there any solution for this to make a rule file??

Thank you for any reply

tibit