Got meaning one. Those days use unleavened bread which is without yeast

http://www.gotquestions.org/unleavened-bread.html

in chinese, ppl pray and change water to wine... wanna try ?

But Jesus did not use the unleavened bread and wine because it is a must. He uses it because He used them with the intention to symbolize His communion with His disciples. There was no other written account that it must be explicitly the aforementioned bread and wine must be used for such symbolization, because symbolization is what symbolization is, it does not have a meaning, except for the ones we give to it.

Take your example of the wine vs. the grape juice for example. Just simply because there is a cost factor, why would it be permissible to use grape juice instead of authentic wine? If the symbolization is indeed as you have said, mandatory and explicitly to unleavened bread and wine, then wouldn't the use of grape juice contradicts this? A simple explanation will be the one I have given, that is as long as the meaning is given to any objects as a form of symbolization, it will fit the symbolization.

Because that's what symbolization really means.