Answer:
You turn me over after you have travelled far.
I am the place to turn when nature calls.
Without a bridle, or a saddle, across a thing I ride a-straddle. And those I ride, by help of me, though almost blind, are made to see. What am I?
I am free the first time and the second time, but the third time is going to cost you money. What am I?
I hold two people together but touch only one. What am I?
Give it food and it will live, give it water and it will die.