I start the day with 2 pints of water, then have a pint of tea then another pint f water then a pint of bone broth then another pint all before midday. Then in the afternoon I roughly have 4 pints and then a pint before bed. I have always suffered constipation and thought this would help however I have since developed Hypopituaryism and I think it's a result of over consumption of water.
My endo says I have to cut down as my sodium is too low. So to answer your question, you should probably have around 4 pints a day.
Also make sure you have filtered water (I have a Berkey now) and try to avoid tap water as this is full of chemicals and metals.