Since I reside in the home of the original 7-Eleven which started out as an ice house that realized from its customers there was a need for certain kitchen staples (hence, "convenience shopping"), *taking a breath* I highly suggest you get to your nearest 7-Eleven for your free small Slurpee. They go very fast on this "unofficial" summer holiday and the machine will run out.
Also, more info I copied from money.com ~
"If you want even more free Slurpees this summer, sign up for the 7-Eleven 7Rewards program and get the 7-Eleven app scanned at a store on Thursday while picking up your free Slurpee. Your 7Rewards account will then have a coupon good for another free Slurpee — in any size you want — redeemable for 30 days starting on Friday, July 12."