How do you personally increase milk supply when pumping I've been drinking coconut water with pineapple juice that doesn't help to much?

I plan on going back to work soon and scared I won't pump enough I pump 1oz per breast some time 3 oz (1oz on one breast and 2 on the other) I been pumping 1 a day. Today I pumped 2 times. I just know she's going to eat a lot at one feeding so I can only imagine a few hours or when I work a full time job
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