'Spring' in the Bible

and should sleep and rise night and day, and the seed should spring up and grow, he doesn't know how.

Does a spring send out from the same opening fresh and bitter water?

Can a fig tree, my brothers, yield olives, or a vine figs? Thus no spring yields both salt water and fresh water.

He said to me, "It is done! I am the Alpha and the Omega, the Beginning and the End. I will give freely to him who is thirsty from the spring of the water of life.