Go to Sharon Zambito's blog- she sent out an email tonight showing how to do the very thing you want to do. Yes, it is possible. http://www.sugaredblog.blogspot.com/
I did a teacup shape once (so - more simple than the bottle) and the one I greased and the one I saran wrapped did not work. The one I coated in powdered sugar did. That will be difficult for that shape tho.... can you do top and bottom instead of 2 sides? That would be easier to mold separately and then fit and trim pieces together later.
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