Half a ball Keeps a steam Good to go All you can eat

On my innards your fingers must remain if liberation you wish to attain; From parties in courtyards to dungeons galore, You now find me on paper and silica core. If finally added to the first of twenty-six, rest assured I'll cause shock in the mix!

The rich have it in expensive walls, plus The poor have it as part of a city bus If you eat it, you might get cancer in your esophagus If not nothing, what am I thus?

Left behind, but always follow. I’m the void, you leave me hollow. In the mud I often wallow, And vanish in the beachy shallows.

For the most part, all I do is drink If I'm clear, I'll happily take more in a blink! Whether the water is dirty or clean, to me it's all the same Careful feeding me! Lest I choke in shame Oh, everyone knows me, I'm the...?