They will send the sake to the Epcot front gate or back gate, depending on which gate you're departing from. Expect a time wait for the delivery to make its way to the gate, maybe a few hours. Ask when buying the sake.
From my personal knowledge, in times past a guest could purchase wine/beer/alcohol at the food & wine festival and carry it with them after purchase. We noticed last year that this had changed, and alcohol had to be delivered by Disney to the exit gate for pickup there.
Just to clarify one thing: food and alcohol were never items that Disney delivered to resorts (from the parks/DTD) thru their complimentary package delivery service.