Combine water, 1/2 of the vinegar, and onion in a pot over high heat; add cabbage, sea salt, celery seed, onion powder, garlic powder, and black pepper. Pour the remaining vinegar over cabbage mixture. Cover pot and bring water to a boil; cook mixture for about 3 minutes.
Stir cabbage mixture and return lid to pot; cook, stirring occasionally, until cabbage is tender and wilted, 10 to 15 minutes more.
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