One of the major themes of the seder is a celebration of our freedom. To demonstrate our freedom, the rabbis instituted the drinking of four cups of wine at the seder.
Ideally, the cups should be of a good wine. If one is concerned that the alcohol will affect them negatively or if they really dislike the taste of wine, they can drink a wine with a very low alcohol content. If that is challenging as well, one can use grape juice for the four cups.
The cup should be at least 3 ounces.
One should drink the entire cup. If that is difficult, one can drink the majority of the cup.
One must recline when drinking the cups of wine.
It is customary to not pour one’s own cups.