Certain researches show that an average European/American uses about 90 liters of water/day for his personal necessities. Yes - 100 liters!!! This quantity seems to be exaggerated, isn't it? It's because you never thought about that. For example having shower twice a day will need about 75 liters of water, the rest 20-30 go on personal consumption (about 1-2 liters/day) and dish washing.
It's high time that we think about this, because we use drinkable water for our necessities, while the world has only 3% of drinkable water from the total world's water system The nearest future may bring a problem like water shortage, which will have irrecoverable effects. Why don't we begin to think about it now and use it rationally, it's still not late