Yup, a breastfeesing mom needs atleasr 2-3L of water per day. Sleeping of 8 hours (more or less) deprived your body of water. The body can live-out food. But cannot leave without water. 90% of body organs needs water to function. Drinking tea carbonated drinks and coffee cannot replace the importance of water. Because when the body lacks intake of water. The body will go into shock due to the water being stripped by other organs. And organs need water to function.