What kind of cheese?

Today, I went to a lake.
Today, I went to a lake and saw my reflection in the water. I picked up a rock and threw it in the water, where it pierced my gut and sent small waves, erasing the features of my face. Then I watched myself return in the water. Then I left, in a daze. ]

At home, I read:

Perhaps he had stumbled a bit and something slipped in his brain. Perhaps something he loved had been lost. Perhaps he had been, unbeknownst to himself, waiting for something uncommon to occur.

Then dad shouted from the kitchen. He asked me how to make a grilled cheese sandwich. What kind of bread? What kind of cheese?