Nursing on demand rather than on a schedule worked best for me.
Eating lots of green leafy vegies, oatmeal, and healthy fats.
I drank fennel tea, water, and oatmeal water as well.
Getting stressed affected my supply with my first babies.
That's what I do too, nurse on demand and eat healthy. To keep up on liquids I always have water at my bed side and drink at every feeding.
I nursed on demand in the beginning then it settled into a schedule around 3 months..