Without the first letter, I become a shower Without rails, I will falter Change my last to L and you follow me on a hike Athletes do me every day to be better

On winter days so cold and dark, you'll be glad to see my mug. I came to you from the distant East, I'll stir you up or bring you peace. Even if you find me bland, you'll spill me to your friend.

I sound a bit like what a Wayward Son is bid to do A group of feathered fiends encircle high, and more accrue With lazy patience, hunting that which cannot even flee When nature sets the table for a feast composed of me

I am the fundamental matter Split me and you're in for a disaster Join me together and the possibilities are endless

A crow, a raven, a corvid, I clad them all. Under the ground, under the sea, 
beyond the space, I'm all you can see.