Jesus gave his life to give us life. When Jesus was pierced in the side, blood and water came out. According to the commentary by Enduring word, blood signifies death while water signifies life.
Two examples where we read about a river/water in the bible:
There is a River of Life in the Holy city that flows.
In my vision, the man brought me back to the entrance of the Temple. There I saw a stream flowing east from beneath the door of the Temple and passing to the right of the altar on its south side. The man brought me outside the wall through the north gateway and led me around to the eastern entrance. There I could see the water flowing out through the south side of the east gateway. Measuring as he went, he took me along the stream for 1,750 feet and then led me across. The water was up to my ankles. He measured off another 1,750 feet and led me across again. This time the water was up to my knees. After another 1,750 feet, it was up to my waist. Then he measured another 1,750 feet, and the river was too deep to walk across. It was deep enough to swim in, but too deep to walk through. He asked me, “Have you been watching, son of man?” Then he led me back along the riverbank. When I returned, I was surprised by the sight of many trees growing on both sides of the river. Then he said to me, “This river flows east through the desert into the valley of the Dead Sea. The waters of this stream will make the salty waters of the Dead Sea fresh and pure. There will be swarms of living things wherever the water of this river flows. Fish will abound in the Dead Sea, for its waters will become fresh. Life will flourish wherever this water flows. Ezekiel 47:1-9 NLT
Jesus and the Samaritan woman.
Jesus replied, “If you only knew the gift God has for you and who you are speaking to, you would ask me, and I would give you living water.” Jesus replied, “Anyone who drinks this water will soon become thirsty again. But those who drink the water I give will never be thirsty again. It becomes a fresh, bubbling spring within them, giving them eternal life.” John 4:10, 13-14 NLT
I believe this same water that I mentioned above is what gushed out when Jesus was pierced in the side. The river of life flowed there on the cross when Jesus gave his life for us.
Not only when Jesus died did He give us a chance to live even after death but he gave life to everything we need to live even now here on Earth. “Dead” situations can live because Jesus gave us life right there on the cross. Our love lives have a chance at living because Jesus gave us life. Our finances can live because Jesus gave us life. Our health can live because He gave us life.
Everything has a chance in living because when He gave His life, He gave us life.