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Whipped cream can be prepared up to 24 hours ahead of time if itâs kept refrigerated. Even then, it may start to separate after a while. The best way to keep it is by placing a fine-mesh strainer over a bowl and placing the cream on the strainer. That way, any liquid will leak into the bowl underneath.
But with the sourness natural to sour cream, I'm wondering if I'm being too cavalier about the subject. Right now I have a container of sour cream in the fridge that's been open about two weeks. It tastes okay, and doesn't expire until April 10th. But I'm wondering how that expiration date is affected once you've opened the product.