"Creaive solutions to the water crisis" (from the same Rawsthorn article in the post below)

- Some of them are being tested at Z33. Hanging outside the building is Rain Catcher, a giant raindrop-shaped device developed by the Spanish designer Jordi Canudas to add rainwater to the drainage system. Taking pride of place in the garden is Pig Toilet, an experimental dry sanitation project devised by the Dutch artists Atelier Van Lieshout. It combines a pigpen with a human toilet, the contents of which are eaten by the pigs, rather than being flushed away and wasting water.

- More conventional (and less stomach-churning) proposals include the LifeStraw, a $5 portable device invented by the Swiss company Vestergaard Frandsen to purify water as it is sucked up through a straw. Another is the Aquaduct, a concept tricycle developed by the American design group IDEO, which carries water, and purifies it using a mechanism started by turning the pedals.

(info taken from http://www.iht.com/articles/2008/08/09/style/DESIGN11.php?page=2)

All of the solutions that are being tested are possible and could work for sure, but you also wonder that during the process of the solutions how much water was used? Or is it similar to "you have to spend money to make money", you have to use water to make water?