Abstract: A smart container that includes a bottle or other container a processor, passive radio-frequency (RF) communications tag (e.g., an RFID or NFC tag) and/or Bluetooth, Wi-Fi, and/or cellular capabilities, and a (colored) light source. The container may hold liquid, food, pills, or another consumable substance. The passive RF communications tag and/or Bluetooth, Wi-Fi, and/or cellular antenna may also be contained on a smart band, a sticker, a button, and/or a keychain or dongle. The light source may include one or more light-emitting diodes (LEDs) which can be programmed to emit unique illumination patterns. The container may also include a speaker or motor to emit audio or vibrational notifications. The container provides a method of tracking consumption by a user of a substance held in a container.