Answer:
I always murmur but never talk. Always run but never walk. I have a bed but never sleep, have a mouth but never speak. What am I?
Whoever made me don't want me. Whoever bought me don't need me. Whoever use me don't know me.
I let water fall on you while everyone else stays dry.
I am essential to life on earth! I am split into thirds. Two thirds are the same. One of the thirds is 8. The other two are 1 each.
Squeeze me and I cry tears as red as my flesh but my heart is made of stone.
I never sleep yet sometimes I weep. I can get angry or just be happy. Wherever you go, I will follow. No matter what you do, I will be there. I cannot die. What am I?