Whenever reference is made in this subchapter to the acquisition of grapes, berries, fruits, or vegetables from sources outside this state to be used for the purposes and in the quantities authorized in this subchapter, for the production of native wines, the term shall also be deemed to mean the acquisition of equivalent amounts thereof in the form of juice, pulp, or blendable wines to be used in the manufacture or blending of native wines in this state within the allowable percentages of such products used in the preparation of juices, pulp, or blendable wines as set forth in the order by the Secretary of the Department of Finance and Administration.