The first miracle of Jesus recorded in the gospel of John happens at a wedding, which is how Scriptures portray our ideal relationship with God: as a marriage, and in fact, the Scriptural narrative as a whole ends at the wedding supper of the Lamb, when we are finally and forever unified with God at the end of this age, following the resurrection and judgement of all. The water that was used to make the wine was intended for ritual cleansing under the ceremonial law, the law which was eventually nailed to the cross with the shedding of Jesus' righteous blood for the remission and forgiveness of sin, when Christ paid the sin debt for all who would believe on Him. This was the institution of the new and better covenant for which Jesus was purposed from before the foundation of the world. Wine represents Jesus' blood, which we are to partake of with His body (bread, for He is the bread of life) in remembrance of Him at the Lord's supper. All of Scripture is about Jesus Christ and the love of God shown to us through Him, Who willingly gave His life as a ransom for many.