Dear Niranjan,
Water requirements will vary based on the age, stage of animals, housing pattern, etc etc . Wat ever is the case you can take approximately 120 liters per animal per day for various activities
For an adult animal weighing 300kg, for ex drinking 60 liters, washing 30 liters, Milking and related 30 liters - Approx 120 literes multiplied by 100 animals 12,000 liters per day, On any given day you need to have a stock lasting for 3 or more days
Project cost will be approximately 75 - 80 lacs on a semi intensive rearing
You caould propose it to NABARD or Nationalized banks
Mail me on for further info
Regards
Rajan