Monitoring urine color could tell you if you're drinking enough water. If the urine stream comes out white, or mostly white, then you're probably drinking enough water. However, if you're not drinking enough, then the urine stream will come out more yellowish.
When I go to Burning Man each year, this is always a vital piece of information the organization tries to get out to people. Being out in the desert and becoming dehydrated from lack of water is not a good thing. It's also make me aware of it back here at home too.
~Sarah