Use a handheld mixer or a stand mixer with the paddle attachment to combine your eggs, buttermilk, warm water, oil, vanilla, and vinegar. Mix on medium speed until smooth, about 2 minutes, scraping the sides of the bowl with a spatula as needed. Pro tip: If you don't have buttermilk, you can make your own substitute at home using regular milk and lemon juice or vinegar. Stir in one tablespoon of your chosen acid with the milk, and let stand for five minutes. This will cause the milk to curdle slightly, becoming thicker and clumpy.
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