How to increase milk supply?

I'm 2 weeks post partum and I wad pumping 4 to 6 oz every pumping session and now it's suddenly went down to 2 oz every pumping session. A couple days ago I went to the ER with 105 fever. I guess I had a UTI that probably spread to my kidneys. Im doing better now but this decrease in supply started the day before my fever. So I'm assuming its related. But I'm worried its going away all together and I'm not gonna be able to produce enough milk for my son :( almost to where he will need formula now with my supply.

I pump exclusively my little one had difficulty latching and I was producing so much pumping it was working good.

Willing to try anything... Vitamins... Tea... Food... Etc... Currently drinking some tea