You can't do better than adequate rest and a healthy diet. All that other stuff won't do diddly if you don't get the first two.
I agree with @sweetvegetable. However just to share my experience... I suffered low milk supply with my first as he was a preemie and I had to express for the first 3 weeks. It just wasnt the same and my production began to waver. I was actually prescribed domperidone which increased my milk supply ten-fold!!! But definitely resting, maintaining a good diet and plenty of fluids will be adequate :)
I took fenugreek 3 times a day and drank milk tea at night. I also looked into foods that help produce more milk I remember oatmeal being something I ate every morning for like the first three months then I found out about fenugreek and that helped a lot too:)
Fenugreek about twice daily, drink mothers milk all day if you'd like its delicious, try rich food such as salmon, avacados, peaches, nuts, and various others. You can go to **********.com and see more tips! But as a nutritionist I recommend also a b12 supplement.
I used Mothers milk tea. My first was born at 32 weeks due to eclampsia and she couldn't swallow breast milk so I was pumping and freezing but still nearly dried up and only expressed way less than an oz per sitting. I guess it's possible that it was a coincidence but my supply shot up to 8 oz per sitting within a week or two.