It is better to take buttermilk by mixing water and making it very thin. It will help you in reducing your thirsty and you need not consume more water. So it is worth taking one glass of buttermilk after breakfast and one more glass around 3 PM.
The above condition, if persist for long then will also result in weakness in body. In technical terms, drinking too much water can result in water intoxication, also known as hyponatremia, causing the inside of cells to flood due to abnormally low sodium levels in your bloodstream. In severe cases, water intoxication can lead to debilitating health problems such as seizures, coma, and even death.
Rightly said, that "too much of anything is dangerous for your health".