Cobb:
What is the most resilient parasite? Bacteria? A virus? An intestinal worm? An idea. Resilient... highly contagious. Once an idea has taken hold of the brain it's almost impossible to eradicate. An idea that is fully formed - fully understood - that sticks; right in there somewhere.
Water is the most resilient, the most renewable, resource we have. Water's reusability is unique--it emerges from literally everything we do with it, everything we do to it, as simply ... water.