How exactly does one "waste" water? It starts as dirty water on the earth, is clarified, is used in the shower, is returned as dirty water to the earth. Water clarification and purification processing capacity can be wasted, but this process DOES NOT waste water.....
"How exactly does one "waste" water?"
By pissing it away?
No, you're right - I changed it to 'personally unnecesary', meaning I don't care what other people do with their showering habits.