They did give him vinegar, soaked into a bullrush so it would reach him. All of which is very interesting because...
"When a man is crucified, his arms are stretched along the horizontal bar of the cross, making breathing difficult. The breath comes in short inhalations and exhalations, since it is difficult and uncomfortable to take a deep breath in such a position. When the vinegar-soaked sponge was put against his face, Jesus, because of the shock of the pungent smell, must have inhaled deeply, which is the natural reaction under such circumstance. But having done so, it would have been very difficult for him to exhale once more. The muscular anatomy of the chest makes this effectively impossible. A painful death from asphyxiation would follow soon after. The last, loud cry of Jesus was probably the sudden, painful inhalation." (Dr Zakaria Erzinclioglu, "Forensics", London 2006).
So Jesus did not die from crucifixion but from asphyxiation. What makes this particularly interesting to Dr Erzinclioglu is that the gospels are religious tracts and were not produced as historical documentation. It made little difference to the authors if Jesus suffered for three days on the cross or died early. Yet the account given in the gospels describes an event which the authors were extremely unlikely to have been able to fabricate because they were laymen and not well enough informed to be able to include such detail. Dr Erzinclioglu sees this as proof that the descriptions of Jesus' death in the gospels were historically accurate.
The gospels also tell us it was normal practise for those being crucified to be pierced in the side with a sword and have their legs broken to precipitate death before the Sabbath started. Yet Jesus' legs were not broken - he was already dead. In fact, when Joseph of Arimathea approached Pontius Pilate for the body "Pilate marvelled if he were already dead: and calling unto him the centurion, he asked him whether he had been any while dead. And when he knew it of the centurian, he gave the body to Joseph". (Mark, Ch 15, V 43- 45).
To Dr Erzinclioglu, this account lends credibility to the other testimony of the gospel writers.