A small amount might not hurt you, but a larger amount especially on a regular basis could be stressful or harmful to your kidneys because of the uric acid content. The kidneys' main job is to get uric acid out of your blood. Adding more uric acid to your blood is stressful to the kidneys and could damage them over the long term. It could also cause gout.
Bill Gates has tried several times with his new technology to help people conserve water and be more aware of te concept of green earth and material recycling.Maybe we will develop something in the future and apply it into every household.
Speaking of urine,I think most of people who have swum in a public swimming pool have already drunk some