I may sound a little nerdy, but you will need me to get into your house

I have a bed, but I never rest. I have a mouth, but I never speak. I can run for miles without any feet, Cold and clear, or shallow and weak. Change my meaning, and I'm a patient man, Who will tolerate what he must, as long as he can. I will not suffer an insult or a lie; I’m a tiny river under an open sky.

Two guys walked into a bar. The third guy, he...

Not a trick, not pretend, nor some imagined deal, I'm what your senses prove and what your heart can feel. I stop the question 'Is this true or surreal?' Name me in one short word