(a) The holder of a winery permit may engage in any activity authorized by that permit on the permitted premises of another winery permit holder under an agreement between the permit holders that is approved by the commission and that describes with specificity the nature, duration, and extent of the activities authorized by the agreement.
(b) The commission shall adopt rules regulating the shared use of winery premises under this section to ensure administrative accountability of each permit holder and a strict separation between the businesses and operations of the permit holders.