How can I infuse bay leaf flavor if I have forgotten to add it to the soup in the beginning?

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Yes, it does.

For maximum flavor, refrigerate it overnight.

You can buy flavoring or put sliced fruit, like peaches and apples, inside the bottle for a month or two.

You may add vanilla extract.

It depends on your liquid content. However, one or two dried leaves should be more than enough. I'm not sure about fresh, but I would assume the same.