Low milk supply..help please?

I was wondering if I could increase my milk supply by hand expressing and pumping. I get less than half an ounce. I stopped breastfeeding for a month (had planned to stop, but have changed my mind), and it is very low and my 6 month old daughter will not nurse at all. She just yells and screams. I give up on nursing, but I want to continue to give her breastmilk 'til she is atleast one years old. Any suggestions on increasing my milk supply without nursing??