Based on user-entered data on domestic water demand, waste water discharge, rainfall availability and recharge, extent of reuse of treated waste water, this spreadsheet-based toolkit developed by Biome Solutions allows you to juggle around with the relevant data fields, and figure out various ways in which you can bring down your overall groundwater draft (and hence ecological footprint) as low as possible, and gives a snapshot result of your overall household-level water input and output situation.
This toolkit is designed for a household in an urban setting.