Rainwater harvesting.

Ground water resource gets naturally recharged through percolation. But due to indiscriminate development and rapid urbainzation, exposed surface for soil has been reduced drastically with resultant reduction in percolation of rainwater, thereby depleting ground water resource. Rainwater harvesting is the process of augmenting the natural filtration of rainwater in to the underground formation by some artificial methods. "Conscious collection and storage of rainwater to cater to demands of water, for drinking, domestic purpose & irrigation"
Broadly there are two ways of harvesting rainwater:
1)Surface runoff harvesting 2) Roof top rainwater harvesting
If you harvest your rainwater, your water savings are even bigger as the water you harvest is used for bathing, showering, laundry and toilet flushing. Rainfall is seasonal, but for the rainy months, you could be self-sufficient in terms of water supply.