Dairy Queen Onion Rings

2 Vidalia or Texas 1015 onions, sliced ½” thick
2 cups flour
2 cups fine cracker crumbs
2 cups white cornmeal
2 cups buttermilk
1 cup Water
4 cups Crisco oil

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Save the very small onion rings for another use. Add buttermilk and water to a large bowl. Mix together flour and fine cracker  crumbs in another bowl. Coat one ring at a time with flour mixture, then with buttermilk mixture, and then coat with cornmeal. Drop into hot oil and fry until golden. Drain on white paper towels.