I recently read somewhere that in the LDS observance of communion, water and leavened bread is used. The practice of communion comes from the Jewish Passover ceremony where wine and unleavened bread was used. Wine is the fruit of the vine and leaven, or yeast, represents sin, so the bread, which represents Christ's body today, was without leaven, or sinless.
Most Christian denominations still follow this pattern today, even though many use grape juice as a non-alcoholic substitute for "the fruit of the vine". So, I was quite surprised to learn that Mormons do not follow this pattern.
Is it true that LDS Churches use water instead of wine or grape juice and leavened bread instead of unleavened bread? If so, where does this practice come from and what is the theological basis for it?