Here is an excerpt from I Corinthians Ch 11 (NIV)
27 So then, whoever eats the bread or drinks the cup of the Lord in an unworthy manner will be guilty of sinning against the body and blood of the Lord. 28 Everyone ought to examine themselves before they eat of the bread and drink from the cup. 29 For those who eat and drink without discerning the body of Christ eat and drink judgment on themselves. 30 That is why many among you are weak and sick, and a number of you have fallen asleep. 31 But if we were more discerning with regard to ourselves, we would not come under such judgment. 32 Nevertheless, when we are judged in this way by the Lord, we are being disciplined so that we will not be finally condemned with the world.
33 So then, my brothers and sisters, when you gather to eat, you should all eat together. 34 Anyone who is hungry should eat something at home, so that when you meet together it may not result in judgment.
I think it is clear here that this congregation served alcoholic wine. It was so much that it caused members to become intoxicated. Verse 30 seems to talk about communicants staggering, throwing up, and dozing, although I have heard it said that this was more a statement of their general health suffering, even unto death.
Verse 34, I would offer, is advice that when one is to receive this sacrament that it should be done with food already in the stomach, so that the effect of the wine will be lessened.
I would also offer that Verse 32 shows that the unpleasant effects of being intoxicated should be taken by the believer bas correction by the Lord and an expression of His love.
Actually, most (not all) of the congregations where I have taken communion have used grape-juice. One church also went so far as to use wafers that were gluten free because of the intolerance of some individuals.