Nowadays water (mainly in Africa) is a treasure. Hungarians has a really good water stock. We should have to use less water. We use drinking water!! in our toilet, to have a bath or a shower... And I think its a fatal failure. In my point of view in 10years the water is going to be the most expensive energy source in the World. Water is our gift, and treasure so we should try to honor it.

Water covers 70% of the Earth, but only 3% of it is clean and suitable for human consumption. Even if you live in an area with ample rainfall, using water requires energy to process, pump, heat, re-pump, and reprocess it. Fortunately, there are ways to save water for everyone, from certified germaphobes to compost-toilet-level conservationists. The average family of four uses 450 litres of water a day, which is 164,000 litres a year.
Save water from your taps. Turn the faucet/tap off while you are brushing your teeth, shaving, washing your hands, doing dishes, and so on. Turn the tap off when you shower, too.
Check your plumbing for leaks, especially leaking toilets and faucets. Fix anything you find leaking. A silent toilet leak could waste from 30 to 500 gallons every day.
Conserving water in the bathroom.
Install low-flow shower heads and faucets or faucet aerators. Low-flow devices are inexpensive. Most simply screw into place, and good, current units maintain the pressure and feel of the flow while using as little as half as much water as conventional units.
Take shorter showers. Take a timer, clock, or stopwatch into the bathroom with you and challenge yourself to cut down your showering time. You could even play music while in the shower and challenge yourself to cut down the number of songs it takes you. Shave outside the shower, or turn off the shower while you shave.
Use wastewater or gray water from the bath, washing machines or dish washing on the garden. If possible, hook up a hose to the outlet on your machine to send the water outside onto your garden. To re-use bathwater use a hand-operated Syphon Pump. When hand-washing dishes, rinse the dishes into a container, and empty the container into your garden.
The problem is how to structure the pricing so that it doesn't harm the poorest households, and instead is felt by businesses and industry sectors that consume the most and need to make the biggest changes to be responsible with water. Some experts point to step pricing, which would protect households who use water simply for washing and cooking, and higher prices for those households - and of course businesses - that consume more.