Am I not drinking enough to produce enough??

I drink approx 100oz of water per day, and I drink maybe 2 cups of half caff coffee, but my pee is always a medium yellow. Much darker than it should be. Do I need to drink more?? Still feel I don't produce as much milk as I should (I had tons with my previous bf baby 16 yrs ago). But at the same time I think I drink almost too much! I still have my prenatals which can alter color but it's still darker than when I was pregnant and I drink more now than I did when I was preg.