Abstract: A fluid intake monitoring system comprises a sensor band and a mobile device. The sensor band is configured for selective attachment to a fluid container and includes a microprocessor, an accelerometer, and an RF transceiver. The accelerometer measures and outputs acceleration data indicative of the movement of the fluid container and the microprocessor processes the acceleration data and computes threshold values. The mobile device is configured to wirelessly communicate with the sensor band and has a mobile software application comprising modules for receiving data from the sensor band, computing and distinguishing drinking events and non-drinking events. True drinking events are stored and compared with a baserate of hydration for a particular user. Alerts are sent to the user for optimized level of hydration.