What can I use to substitute white or pink champagne?

You can substitute with any Sparkling wine.

Korbel makes an excellent one for arround $12.

Robert Mondavi Woodridge Brut would also be good for baking at about the same price.

Both are widely distributed and easy to find.

Best Pink Champagne Cake Recipe

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A bottle of cheapy champagne is like $3, seriously, it's nothing

BUT if you must, then use a mixture of 2 parts club soda to 1 part white grape juice

just buy an american sparkly wine like korbel, ballatore, etc. instead. you shouldn't spend more than $10 on it at the store .Andre Pink Champagne is only $4.99 per bottle.

you can buy cheap champagne and use it in the recipe

use sparkling wine - i like cava the best but any sparkling wine would do the job

cava