I had already asked "drink a lot of water after consuming food(lunch/dinner) around 2 litres. Is it good or bad. Will it make my digestion power less or put on more weight?" doctor had asked for more details like:
The amount of water consumed after lunch - 1 litres (no cold water) and after dinner its 2 litres.
Frequency - 6 to 7 times a day
quanitity - may be 100-150ml (normally)
after consumption of water it increases.
Can you let me know if its diabetes insipidus as you said?