need suggestions on how to

Build my supply other than drink more water. That doesn't help me.. I'm 2 months pp and still only pumping 2 oz out of each breast after a few hours if I pump every couple hours I only get an ounce out of both. And he doesn't last long on the boob after a bit he cries he sucks for a second and then let's go crying like he's not getting anything out of it. Because if my low supply I've had to give him formula as well. And it's costing us money we don't really have so.. please breastfeeding mommies any suggestions will help I feel like crying so bad because I'm not producing enough for my baby..