[W]hat w[ere] Jesus and John the Baptist trying to do in the wilderness at the Jordan River? And then what is the significance of water? Was it a symbol....was it spiritual?
Good question! Very key.
There is a fundamental difference between what John was doing there, and what Jesus was doing there, as evidenced by John's own confusion about the matter: "I have need to be baptized of you, and you come to me?"
John was baptizing with a baptism of repentance only, and not with the the baptism of Christ, i.e. with Holy Spirit. He was preparing the people to receive Christ: "Prepare ye the way of the LORD, make straight in the desert a highway for our God."
By the uniformity of the method and the ubiquity of water, the people were made equal to one another before Him: "Every valley [that is, the humility of the poor and needy] shall be exalted, and every mountain and hill [that is, the pride of the rich and abundant] shall be made low." (This is the part, I think, that you are angling at with your question about the price and availability of water. There is more than just that, but it is definitely part of the weave.)
By obedient repentance, the people were made morally pure as well: "and the crooked shall be made straight, and the rough places plain."
Thus the people were prepared and made worthy to receive the LORD in the revelation of His glory: "And the glory of the LORD shall be revealed, and all flesh shall see it together: for the mouth of the LORD hath spoken it."
And what do we (Orthodox) sing?
When Thou, O Lord, wast baptized in the Jordan, the worship of the Trinity was made manifest, for the voice of the Father bore witness unto Thee, calling Thee His beloved Son, and the Spirit in the likeness of a dove confirmed the truth of His word. O Christ our God, Who hast appeared and enlightened the world, glory to Thee!
So the work of John on the people was to prepare the way for the Lord Himself. Then the Lord Himself came and walked this highway that John had prepared, not in order to receive repentance Himself, but to sanctify the waters and reveal Himself in them, crushing the heads of the dragons in the waters, and make them the means of unification with Himself by the Holy Spirit.
Now, how is it that "all flesh shall see it together", when the baptism of the Lord was a local event, with whoever happened to be there at that time witnessing it?
Because the baptism of the Lord is the beginning and fountain of the Church's baptism, to which all are commanded by the Gospel command to enter, and "this Gospel of the Kingdom shall be preached in all the world for a witness unto all nations." So they were commanded,
Go ye into all the world, and preach the gospel to every creature. He that believeth and is baptized shall be saved; but he that believeth not shall be damned.
And what is the beginning of the Gospel?
The beginning of the Gospel of Jesus Christ, the Son of God: ... John did baptize in the wilderness, and .... Jesus came .. and was baptized of John in the Jordan.
For the grace of God that bringeth salvation hath appeared to all men ... For we ourselves also were [sinners]. But after that the kindness and love of God our Saviour toward man appeared, not by works of righteousness which we have done, but according to his mercy he saved us, by the washing of regeneration, and renewing of the Holy Ghost; which he shed on us abundantly through Jesus Christ our Saviour; that being justified by his grace, we should be made heirs according to the hope of eternal life.
(See my posts above for the inheritance aspect...I'm focused on the appearance and blessing of Jordan here, in answer to your question.)
And so the Church prays together, when preparing the waters for baptism:
That this water may be sanctified with the power, and effectual operation, and indwelling of the Holy Spirit...
That there may be sent down into it the grace of redemption, the blessing of Jordan...
That there may come upon this water the purifying operation of the super-substantial Trinity...
That we may be illumined by the light of understanding and piety, by the outpouring of the Holy Spirit...
That this water may prove effectual unto the averting of every snare of enemies, both visible and invisible...
That he who is baptized therein may be made worthy of the Kingdom incorruptible...
For him who is now come unto holy Baptism, and for his salvation...
That he may prove himself to be a child of the Light, and an heir of eternal good things...
That he may be a member and partaker of the death and resurrection of Christ our God...
That he may preserve his baptismal garment and the earnest of the Spirit pure and undefiled unto the dread Day of Christ our God...
That this water may be to him a laver of regeneration, unto the remission of sins, and a garment of incorruption...
Then the priest completes the prayer as follows:
Great art Thou, O Lord, and marvelous are Thy works, and there is no word which is sufficient to hymn Thy wonders. For Thou, of Thine own good will, hast brought into being all things which before were not, and by Thy might, Thou upholdest creation, and by Thy providence Thou orderest the world.
For Thou, who art God inexpressible and everlasting, didst descend upon earth, and didst take on the semblance of a servant, and wast made in the likeness of man. For, because of the tender compassion of Thy mercy, O Master, Thou couldst not endure to behold mankind oppressed by the Devil; but Thou didst come, and didst save us.
We confess Thy grace. We proclaim Thy mercy. We conceal not thy gracious acts. Thou hast delivered the generations of our mortal nature. By Thy birth Thou didst sanctify the Virgin’s womb. All creation magnifieth Thee, who hast manifested Thyself. For Thou, O our God, hath revealed Thyself upon earth, and dwelt among men. Thou didst hallow the streams of Jordan, sending down upon them from heaven Thy Holy Spirit, and didst crush the heads of dragons who lurked there. Wherefore, O King who lovest mankind, come Thou now and sanctify this water by the indwelling of Thy Holy Spirit. And grant unto it the grace of redemption, the blessing of Jordan. Make it the fountain of incorruption, the gift of sanctification, the remission of sins, the remedy of infirmities, the final destruction of demons, unassailable by hostile powers, filled with Angelic might; that those who would ensnare Thy creature will flee far from it. For we have called upon Thy Name, O Lord, and it is wonderful and glorious, and terrible unto adversaries.
Let all adverse powers be crushed beneath the sign of the image of Thy Cross. [here he makes the sign of the cross in the water, repeating this last bit three times, the Church answering, "Amen!" each time]
When the person goes into the water, he is immersed (we don't sprinkle or pour except in extreme circumstances where immersion is not an option for some reason and death is imminent) three times (we do just about everything three times -- symbolizing the Trinity, and also, in this case, the three-day burial), each time accompanied with the prayer, "The servant of God [name] is baptized in the name of the Father, and of the Son, and of the Holy Spirit."
He is then given a new, white robe, and told, "The servant of God, [name], is clothed with the garment of righteousness, in the Name of the Father, and of the Son, and of the Holy Spirit", to which he responds with the prayer (the Church singing with/for him): "Vouchsafe unto me a robe of light, O Thou who clothest Thyself with light as with a garment: Christ our God, plenteous in mercy."
Likewise in the Feast of Theophany (the baptism of the Lord), we sing:
Ye faithful, let us praise the greatness of God’s dispensation toward us. For, becoming man on account of our transgressions, he who alone is clean and undefiled was cleansed in Jordan that we might be made clean, sanctifying us and the waters and breaking the heads of the dragons in the water. Let us then draw water in gladness, O brethren; for upon those who draw with faith, the grace of the Spirit is invisibly bestowed by Christ, the God and Savior of our souls.
And also,
The Trinity was made manifest in the Jordan. For, supreme in Godhead, the Father proclaimed, saying, “He Who is here baptized is My beloved Son,” and the Spirit rested upon His Equal in Godhead, whom the peoples bless and exalt above all forever.
So one question is:
Does the Lord answer the prayers of the Church or not?