FIVE THOUSAND pounds of ice: as heavy as a young elephant, or five wading pools filled to the brim. Dylan Williams, the owner of Beaucoup Nola Juice in New Orleans, hauled it all in a refrigerated truck from New Orleans to Manchester, Tenn., last week, to supply his snow cone stand at the Bonnaroo Music and Arts Festival. He also had a pile of watermelons, jugs of mango and pineapple juice, and two SnoWizards, stainless-steel contraptions that produce the silky, fluffy ice shavings required for a true Louisiana “snoball.” A snoball is to a snow cone as Warren Beatty is to Shirley MacLaine: closely related, but prettier, smoother and infinitely cooler. “In New Orleans, you can get killed if you call it a snow cone,” Mr. Williams said.