Hardships

This is a story by me, Maple.
==Prologue==
In the shadows of night, a dark, almost invisible figure slipped swiftly behind a tall oak tree. Poking what seemed to be its head out from behind the tree, the figure took a few quick glances and then swiftly ran to what seemed to be two berry bushes.
Behind the berry bushes was the entrance of a cave just big enough for an adult cat to pass through. The figure went through the tunnel, which was really long. The figure emerged from the tunnel and into a small cave at the very heart of the mountain. Inside the mountain was a pile of large sticks that were burning, and just able to be seen were two minerals, some flint and some steel, that had been used to light the fire. The figure could now be seen easily. The figure turned out to be a black-pelted cat with green eyes, and he was using a stone hollow in the ground nearby the fire to brew some kind of potion.
The cat had four items clasped in his mouth. First he dropped a mouse by another stone hollow, this time smaller and by the wall. This hollow had moss inside and was big enough for an adult cat to sleep in. The other three items were a branch from a deathberry bush, in which he picked two deathberries and dropped them inside the water-hollow with his paws. Going to the underground river, he dipped his forepaws, the ones that had touched the deathberries, into the freezing cold cave water. The second item was a sprig of holly with three holly berries on it. The cat had dubbed these holly berries painberries, and dropped the sprig into the water-hollow.
The last item were three foxglove seeds, which he also dropped into the water-hollow. Underneath his chin, wrapped in moss, were deadly nightshade and water hemlock. Everything, even the moss, was dropped into the water-hollow, and then he dropped a mouse inside, the other mouse that was inside the moss. Then he mixed it all up with a long, thick stick and then the water turned murky green, and it was bubbling.
Taking a spinny thing with a pointed end called a 'drill', or whatever Twolegs called it, (he had learned the word 'drill' from kittypets) he hollowed out a channel that joined the river when it left the cave, but he left enough space to drink from the river before it reached the Clans.