The Sacrament

I use to ask myself fairly often why we take the bread and the water/wine/whatever you use with the sacrament. Of course they have to do with reminding us of the body and the blood of Christ which was slain and shed for us, but where is the real correlation between these two things? Why can't just one thing remind us of the atonement rather than two? Or why is it important that he suffered seperately between the Garden of Gethsemane and on the cross on Calvary? After a lot of changes to my answers I finally found one that seems fairly concrete and well supported. Starting with the base of the reason for the sacrament: The Atonement consists of the suffering in Gethsemane (which allowed Him to go through all of the temptations, pains, and infirmities that we go through that he may atone for those things), the crucifixion on the cross (which put an end to all of life's temptations and pains, and sanctified him to the next level), and the resurrection or his spirit and his flawless, immortal body (which broke the bands of death allowing us to do the same and to all individually be reunited into full fellowship with our Heavenly Father once again). With all of this in mind: the bread, representing His body, reminds us to be sanctified and put a 'death' to pain of sin or temptation as we covenant to take His name upon us, remember Him, and keep His commandments; and the water, representing the blood He spilt, reminds us that the blood He spilt continues to atone for our sins and all kinds of pains as we covenant to Him that we will always remember Him. As we keep our parts of this covenant He will allow His spirit, or the Holy Ghost, to always be with us.
I wrote a lot more about this separately but I think this describes it enough for now.