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?

In summer's sun, I wear a thick armor, inside I hold a sweet, juicy treasure. Slice me open for a refreshing delight, a cool escape from the heat's tight grip.

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...?