The thing that will help your supply the most is more feedings/pumping. The more you feed and pump the more it signals to your body to produce more. Unfortunately, with only one feeding it's unlikely you can up your supply even with adding galactagogues and upping your water supply.

Yeah all I'm doing is one feeding of breast milk at night and I am noticing that I'm not producing any more. should I eat some lactation cookies? or something that will help?@kmally

Do you mean like supplementing? So breastmilk for a feeding and formula for the others? Every drop counts and it's totally up to you :) if you plan on keeping your supply up it's unlikely you'll have a supply with only one feeding a day.