Historical clue formulations

• Drink with an onomatopoeic name — 2022-07-15
• Brain freeze cause — 2022-04-01
• Popular ice drink — 2021-02-13
• 7-Eleven cooler — 2008-08-27
• Trademarked chilled drink — 2007-03-11
• Popular 7-11 drink — 2001-12-09
• 7 Eleven cooler — 1998-10-25