Ask them. I think they decided to ignore the Word of Wisdom and drop the wine from their sacrament menu and since they didn't have refrigerators in the mid 1800's to keep the grape juices from fermenting, they used water. There is plenty of water around Salt Lake City and grapes don't grow too well there.
I distinctly remember they always used Weber's Bread and removed the crust. FWIW, Webers bread contains leaven.
Thanks. (”sacrament menu” lol)