In my religion (I'm a mormon) we drink water as we take the sacrament. We do this because It's symbolic of the death of Christ. The point is, it doesn't matter what you drink or eat for the sacrament as long as you're taking upon the name of Christ and remembering his sacrifice for us. If there were a sudden drought and all we had was milk, then that would work just as well. I don't know what religion you're a part of - but I'm guessing you're a Christian - but the same principles apply to each Christian religion.
because this symbolizes the blood of Christ, and the unleavened bread is the body of Christ. Back in the Bible days I think they actually used wine. But, they don't do that anymore. They use grape juice probably because you are suppose to be 21 to drink, and I would say it is cheaper to buy a bottle or grape juice instead of wine.
Well, its not sudden. Been used for decades by denominations who dont believe in drinking alcohol. Besides, wine is just fermented grape juice so theres not a huge diff. other than alcohol content. The so called 'wine' drunk commonly in biblical days lay somewhere between wine and juice. Not nearly as potent as actual wine today but with a tad more kick than straight juice. God doesnt say 'thou shalt use ONLY alcoholic bearing wine to represent my blood during communion'. Its the commemoration not the alcohol content thats important.
I grew up as a kid in Germany and we always had a sip of wine during Holy Communion. Today in the U.S. it's now grape juice perhaps because: 1.It's cheaper. 2.It's the U.S.A. (My guess is that in Europe they still partake, since in places like France children are often given a small amount of wine with their lunch or dinner under parental supervision.) 3.Recovering alcoholics and children aren't supposed to drink wine. 4.Decrease the possibility of (more) bad press or negative public relations. 5. It would give the Church less to whine about. (*groan*)