Answer:
I cost no money to use, or conscious effort to take part of. And as far as you can see, there is nothing to me. But without me, you are dead.
He stands beside the road. In a purple cap at tattered green cloak. Those who touch him, curse him.
Gets rid of bad ones, short and tall. Tightens when used, one size fits all.
What flies without wings? What passes all things? What mends all sorrow? What brings the morrow?
Plant whose name sounds like a dish full of dairy spread.
I am a animal that is cute but dangerous, what am I?