A mind blowing, changing experience?
Well, reducing the amount of supplied water for one day.
Harsh, but the only way people here would understand the daily dependence of water. If thats not possible (most likely), the government could force the media for 5 minutes at the best evening time to discuss this matter. If thats not possible too, the government could proclaim a "week of water". Public media most likely would follow this lead with some doc**entations and articles.
If thats also not possible, get the most famous music stars for a festival in the name of the water crisis.