How do i make my hair less greasy (without using shampoo?

I'm doing the whole no shampoo dealio
read about it here:http://www.msnbc.msn0o0com/id/30337386/ns/…

i don't have the baking soda stuff it recommends, so i was just wondering how i could reduce the grease in my hair so i'm not tempted to go back to shampoo (it's been one day and my hair is horrible)