Monitoring the human hydration level (BHL) is a key factor in preventing urinary system disorders. The paper proposes a smart holistic system that comprises two components: (1) a urine colour measurement system that can be installed in restrooms, and (2) a mobile app that can be used to interact with the measurement unit, track the user's BHL, view statistical data and advice. The main prototype was built based on low-cost embedded Internet devices coupled with RGB sensors and light sources. Based on the RGB theory, the system was tested in a laboratory, using liquid mixed with food colour of different shades. Results were presented on the mobile app. The system was successfully implemented, as a ubiquitous "on-the-go" self-test solution for raising awareness in a "greener" and "user friendly" way.