Agree with both Ayushji, and Pankajji..,
Saving Water is important as well as Retaining our traditions and festivals...
its good to make a rule for ourselves...
The one who has not wasted water whole year...., he/she only should have the right to celebrate Holi with water....
Holi... its not only about playing with colours... its about filling the colours of happiness and joy in other's life... If we succeed in it... means we celebrated Holi... Happy Holi..:)