Isadora Whitewing wrote:

Well I think this would be true if it were in his studio.  Does this really count if its an outside thing?

Yes because you are drinking during an activity which he has hired you for, and even if it is TFP/TFCD that is payment, which means you are hired by him for that time period.Regardless of where you are,he would be resposible.Especially since HE brought up the idea of drinking along the way as the shoot progresses.