The symbols of the sacrament of the Lord Jesus Christ that we use in The Church of Jesus Christ of Latter-day Saints are bread and water. When the bread and water are blessed in Sacrament Meeting at church, they are done in just that order – the bread first and then the water. We do this because that is the order that the Savior instituted the sacrament.
The bread of the sacrament represents Christ’s body. The water represents His blood. In that vein (pun intended), the bread represents Christ’s power over the body, over physical death. The water represents His atoning blood and power over spiritual death. When we partake of the sacrament we do so as part of our repentance of sins (strictly speaking, we do not repent through the sacrament, we should repent before we partake of the sacrament; however, the covenants we make during the sacrament are similar to the ones we make during baptism. Through the sacrament the Lord blesses us with the Holy Ghost; the Holy Ghost justifies us to God. Thus, in a lot of ways partaking of the sacrament is part of our repentance process). Further, when we partake of the sacrament we are also doing so in remembrance of the resurrection of Jesus Christ and looking forward to our own resurrection. Christ provides salvation over death and hell through His body and blood.
I have written about this before but I taught this yesterday to my Priest Quorum and thought the concept was worth reposting.