Start with the substitute closest to champagne vinegar’s mild, slightly fruity tang (white wine vinegar or ACV).
Use the listed ratio; if using a sharper vinegar (like distilled white), start with slightly less to avoid overpowering acidity.
Taste after mixing into the dish (especially dressings and marinades) and correct balance with a small pinch of salt or a tiny amount of sweetness.
For baking, dissolve/dilute acidic swaps evenly in wet ingredients so the batter rises predictably.
Let flavors sit for 5–10 minutes before judging—vinegar brightness softens as it hydrates.