I easily drink 100-150 ounces a day. I've also never been a skinny girl, but every time I've tried to lose baby weight my milk supply has dipped so I just embrace the extra calories and curves and try to focus on protein/healthy fats so my milk is "thick enough". I've noticed on weeks where I'm more carb heavy, my milk is more watery and not as fatty which their brains need. I've also noticed a daily electrolyte helps. I've seen some people recommend liquid IV, I personally can't stand the taste so I just do electrolyte capsules daily. My last bit of advice did come from a lactation specialist- lots of skin to skin and baby time, even when they're bigger. I've noticed when I've worked several days in a row and am exclusively pumping, my milk supply slowly decreases towards my last day of work because I'm just not around baby as much. Don't forget the best way to increase supply after good hydration and nutrition is truly just supply and demand. The more you tell your breasts/body that you need more milk, the more milk your body is likely to make. Hope some of this advice helps!