Water is one of the most necessary elements for life as we know it. Human beings are in trouble physically within three days with no water. Other creatures may be able to last longer but ultimately all creatures need water in some form.
We are a water rich world, but the water is not always where it is needed or may be too salty or polluted for use. Groups like Heifer International have programs to help drill wells in areas of particular need. Even in the United States, there are places of water crisis for cities and farms. We may, in the future, have to better figure out how to manage the water supply for the benefit of all.
I know that I am personally not as careful as I might be to avoid wasting water. I know that I could find better methods of conservation.
We get some sense of the significance of water in the story of Jesus and the woman at the well. Her need of physical water becomes the occasion for Jesus to use water as a metaphor for spiritual life. Jesus said, “…those who drink of the water that I will give them will never be thirsty. The water that I give will become to them a spring of water gushing up to eternal life.” (John 4:14)