Wow, I just read the Doctrine of Covenants at 500 words per minute... What was your question again?

TO ELABORATE FURTHER, THE RATIONALE FOR SWITCHING FROM WATER TO GRAPE JUICE IS SIMPLE AND LOGICAL: First we know from the historical record why this change from wine to water was originally made: "There is evidence that Joseph Smith himself liked a nip now and then, especially at weddings. But in 1836 he acceded to the temperance preferences of his colleague Sidney Rigdon and substituted water for wine as the beverage used in the sacrament of communion. (This tradition continued even after pasteurized grape juice was invented and swept most of the Protestant marketplace.) Still, Smith's own Mansion House, which operated a hotel, maintained a fully stocked barroom, and Nauvoo also had a brewery that advertised in the church newspaper, the Nauvoo Neighbor. According to the writings of Smith's fellow prisoner John Taylor, later the church's third president, the prophet requested and drank wine at Carthage Jail the night before he was murdered in 1844." -- Mormon America - Revised and Updated Edition: The Power and the Promise; p. 181 So while we can applaud this move toward temperance, the fact remains that Grape Juice isn't wine. In fact most alcohol abstaining churches switched from water to wine with the introduction of Welch's Grape Juice in 1869 - why the LDS Church didn't seems odd! Further doesn't verse 4 of D&C 27 (circa August 1830, yet oddly not implemented until 1836) imply this change when it says: "Wherefore, you shall partake of none except it is made new among you..." So, couldn't you interpret "made new" as a prophecy concerning the coming of Dr. Welch's wonderful invention of unfermented - that is "new", not aged - Grape Juice in 1869? After all, doesn't Moro 6:5&6 say? "And the church did meet together oft, to fast and to pray, and to speak one with another concerning the welfare of their souls. And they did meet together oft to partake of bread and wine, in remembrance of the Lord Jesus." What's stopping the LDS Church from making a change that it seems could have been easily (and IMO should have been) made way back around 1869?

Why should we? You give various reasons why the change to water was made, but you have not really given any reasons why we should change that to grape juice.

We use grape juice and I don't know why they do not . I can only guess that they can not afford the juice or too many people have reactions to the juice.

I never knew any church used water!

my guess would be price and conveniance. water is readily availible at any tap and costs pennies. the same reason they generally use plain white bread and not waffers or expensive gormet breads

Joseph Smith Jr was procuring wine for the Sacrament of the Lord's Supper when he was warned (through revelation) that the enemies of the Church would sell him poisoned wine. The revelation continued by stating that /any/ emblems could be used to represent the Lord's flesh and blood. That was the first time water was used instead of alcohol. When the Word of Wisdom (which expressly allows alcohol for the Sacrament) was starting to be enforced, it became standard to use water. Water is so ingrained into our tradition that wine (or even grape juice) would call too much attention to itself; instead we need to focus on /why/ we partake of the Sacrament (Jesus' Atonement, how we can improve, etc).

Since a revelation said that it doesn't matter what is used, it seems very logical to use water. It is easily available, and doesn't stain when spilled.