I'm sure that this has been discussed before but I missed it so I have a few questions concerning the Lord's Supper. Is it absolutely necessary that unleavened bread and grapejuice be used in the Lord's Supper? Suppose that a pastor and some of his flock were stuck on a deserted island and didnt have access to unleavened bread and wine. Can a substitute be used such as coconut and coconut milk since it is symbolic? If the elements of unleavened bread and wine cannot be had should the ordinance be neglected?