tips for breast milk supply?

Patrica Nicole • 23 y/o wife & a mommy to a handsome 4 year old
I'm low on breast milk and I need tips on how to get more! Last time I pumped was yesterday and it was only twice. First time was 3 ounces and 2 ounces in 15 minutes the second time was about 2 ounces or a little less. Today my breasts feel like they have nothing and they're soft and squishy. I really want to breast feed at the same time as use formula since it's so expensive. Any tips?