The simple answer is the same for a healthy woman breastfeeding
or pumping. You should be drinking enough water to quench your thirst plus a
bit more.
Not exactly quantifiable, we know.
So instead think of it this way: if you are asking your body to
create more liquid output in the form of breast milk, you’ll want to increase
your liquid input. A general guideline is to drink an extra four 8 oz glasses of water daily.
But you’re busy! You have a baby to care for and a life before
pregnancy to remember and a schedule to return to and – jeez – how can you
remember to drink (and then actually drink) an extra four glasses of water
daily?