Portable beverage container systems and methods for adjusting the composition of a beverage

A beverage apparatus that is hand-holdable by a user and portable, the beverage apparatus comprising:

• a beverage chamber configured to hold a consumable liquid;
• a vessel containing an additive to be combined with the consumable liquid to form a beverage, the vessel including a valve through which the additive is dispensed into the consumable liquid;
• a tag that includes a tag memory portion (TMP) and a tag communication element, the tag being affixed to the vessel;
• a controller that includes a processor and memory including instructions implemented by the processor, the processor configured to communicate with the tag;
• and
• a communication element configured to transmit communications between the processor and the tag;
• wherein the processor is configured to identify a change in state of the beverage apparatus, adjust a value of a state variable based on the change in state from a first value to a second value, and cause the second value of the state variable to be written to the TMP of the tag.