The Hebrews got thirsty during their desert journey, and their complaining showed their lack of trust in God and a deeper spiritual thirst.
The woman came to the well to get water, but had deeper spiritual thirsts as revealed when she told Jesus she had no husband.
It's telling that Jesus was physically thirsty and asked the woman for a drink of water. Yet He also thirsts for us to come to Him and have our deeper spiritual thirsts satisfied by His endless well of life-giving water.
While we might try to satisfy our thirsts in other ways, only water meets our bodies' need in the fullest way, and God alone offers us living water that can keep us whole. It's similar to how we don't just feed on bread alone but on God's Word.
We turn to Him because when we were sinners, Christ died for us, and from His death and Resurrection, He has poured out the Holy Spirit into our hearts so we can constantly be in touch with living waters that invigorate our souls.
I recall being at St. Augustine Mission, founded by St. Mother Katharine Drexel, 13 years ago on the 3rd Sunday of Lent. She saw great need among the African Americans and Native Americans, and thirsted for someone to meet it. Pope Leo XIII told her to be the missionary to them.
Her thirst drove her to find her purpose in life, and then to work in fulfilling the thirst of the needy, just as we can do when we draw constantly on the living water of God.