As I understand it, no - everything that you want to sell through a purchase through an application goes through a verification process similar to the process of the applications themselves. Apple will not allow, for example, the "photo of the day" application, if you can in the application purchase pornographic photos to be sent to you every day.
What you can probably do is send your app with a backlog of in-app purchases five or six days ahead of schedule, and then sequentially send your daily items earlier when you want them to be available. Not sure how reliable the review process is or whether it will work for your situation - just a thought.
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