While you can generally bring in any container to fill up, there are a few guidelines to adhere to:
- Your "cup" must fit within the 10" hole on the Bring Your Own Cup Day stand in each store.
- It must be food-safe and clean.
- It must be watertight.
- The offer is limited to one cup/container per person.
The promotion is good at participating stores from 11 AM to 7 PM on August 18th and 19th.
Photo via 7-Eleven.