The only things you can count towards your water consumption (other than good old H2O) are:
decaffeinated beverages (example: diet coke - caffeine free)
crystal light products
juice (I think - I don't have my book here)
They all count towards your water intake. Of course straight water is best in my opinion. I never count the above in my water total for the day. So really I get more water in! (I have skim milk and juice every morning).
I hope that helps!