Isaiah 40:8 The grass withereth, the flower fadeth: but the word of our God shall stand for ever.
Psalms 12:6 The words of the LORD are pure words: as silver tried in a furnace of earth, purified seven times.
Psalms 12:7 Thou shalt keep them, O LORD, thou shalt preserve them from this generation for ever.
I believe that the Word of God is true and preserved as He would have it to be. He created all things, (visible and invisible,) He certainly is able to preserve His word for those who seek Him.
The only other options are to trust in men, or trust in our own understanding...
Judges 17:6 In those days there was no king in Israel, but every man did that which was right in his own eyes.
Proverbs 3:5 Trust in the LORD with all thine heart; and lean not unto thine own understanding.
Psalms 118:8 It is better to trust in the LORD than to put confidence in man.