The document calculates an individual's daily and monthly water usage as 25 liters and 100 liters respectively, equivalent to 2.5 gallons and 10 gallons. It then compares this individual usage to a family's monthly water and energy bill of 130 liters and 1,694 KWH costing $35.79 and $70.19, finding the individual uses less at 100 liters and 847 KWH costing $18.50 and $55.