How to calculate water cost per day from a borewell?

The water supply is from two source i.e. 1]muncipal corporation , 2] through Borewell . We calculate the water consumption per day & water cost per day from water bill . In case of borewell we can calculate water consumption per day from meter reading but how to calculate water cost per day, because in estimation of water quantity for office we have calculated it as additional expense . Please give us advice for this case though mail at the earliest.

Regards,
Ravi Tulankar

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