The only word's Christ spoke on the cross that seemingly alluded to his physical suffering.
One of the most amazing things to me about the crucifixion is that Jesus continued to minister to the needs of others while nailed to the cross.
"Today you will be with me in Paradise."
"Woman behold your son."
"Father forgive them..."
Even while hanging in mortal agony the focus of His thoughts were towards the needs of his sheep. So when He said those words, "I thirst."... was he really after water? After all He created it. He had even turned the water he created into wine...surely water would have been a small thing for Him to produce. Nobody would have blamed Him.
What were you thirsting after Jesus?
Could we find the answer in the sermon you preached on the mount. "Those who hunger and thirst for righteousness...shall be filled" And if your thirst wasn't really about water at all, but was actually about righteousness...even your thirst was not about yourself. You were already spotless, sinless, the lamb of God, pure, the Holy One of God. Could it be that the righteousness you were thirsting for was actually our righteousness, and that even in those words you were still focused on us?