The Symbol is: Living Water.
It is a symbol of the Lord Jesus Christ and his teachings. As water is essential to sustain physical life, the Savior and his teachings (living water) are essential for eternal life.
“It frankly does not make sense to occasionally 'fill up' with water, with long periods of dehydration in between. The same thing is true spiritually. Spiritual thirst is a need for living water. A constant flow of living water is far superior to sporadic sipping.”
~David A. Bednar