Many years ago there was a powerful goddess, but she was lonely so she decided to create
The fist thing she created was the world, but is was to empty and dark so she decided to keep creating.
On the second day she created the sun, but she noticed that it was missing life and that none of her other creations could survive the harsh climate.
My darling brother, you will work for me, an with you power I can finally get ride of water. But first we will kill all that is dear to him.
On the third day she finally found what she had been missing; her must treasured son, water. With his existence, he brought life and prosperity. Sadly she had used so much of her power, so she could no longer interfere in life; but before she left she made sure that all her children interacted peacefully.
The goddess was extremely mad that her creations were wasting and destroying all the things she had created for them to enjoy, including her most priced child, water. She decided they needed a lesson to appreciate what she gave them.
Dehydration, that had heard of her mother's wish to teach her creation a lesson thought that this would be a great opportunity for him, he could get rid of his brother water and become the favorite.