The information is stored on the chip in the mug, it says so on the website of the manufacturer.
http://www.validfill.com/faq
What information is stored on the RFID tag attached cup?
The RFID tag stores multiple types of information to include the following:
· Cup Type (Hot or Cold)
· Cup Size (in Ounces)
· Company
· Location
· Date Purchased
· Location Purchased
· Number of Times Used
· Number of Refills Remaining (Date or Specific #)
· Time of Last Use
Also, as you can tell from the website, this is a third party product that Universal and Disney have bought, it wasn't created by Imagineers.