I am wondering what ingredients do the Jehovah's Witnesses use in the bread and the wine. I talked to one of my friends who is a active member of the Jehovah's Witness religion but was not satisfied with her answer.
To find a proper answer to this good question, have a look at their 12/15 2013 Watchtower magazine. The paragraphs 5-7, under the subtitle 'The Emblems' should interest you.
As a summary, the bread was made from wheat flour and water, without any leaven or seasoning, such as salt, being added. Because it was unleavened, it would not have risen.
[UPDATE] They recently edited a video on how to make the bread : How to Make Memorial Bread
For the wine, as there was no need for augmenting or fortifying the value of Jesus’ blood, the wine used is not a type fortified with brandy or spices. Plain red wine should be used, a homemade wine or a commercial wine, such as Beaujolais, Burgundy, or Chianti.
E 1. 240 grams of flour
60 ml of water
Mix untill the dough does not stick on the wall of the (glass) potter.
Take the dough on the table and with a bit dried flour mix it about 5 min.
Separate the dough in 2 pieces and make them into round balls and then stretch them like round plates of about 3 mm.
Put the dough plate in a slightly oiled Pan and perforate some holes with a fork.
Place the Pan in a preheated oven with 230 Celsius for about 8 Minutes.
Watch this video: How to Make Memorial Bread.