Effervescent Water ~ Part 3

Still there's the second batch of six words left over from yesterday. Those are:
Zero 
Simple 
Clockwork 
Brain 
Study 
Size

I continue the strange story about the effervescent water. Using the words in order, only not Clockwork - I could not make it fir at all.

"I don't know anything," Hilde said. "Thora took the water and things with a curt thank you. And she closed the door very securely - or maybe she even used a soundproofing spell, because I could not hear a word from in there. Nothing, zilch, zero!"

The green team went to their normal classroom and sat down. Nobody said anything, Terje was sniffing at regular intervals due to hay fever until Hilde lost her patience with the sound and in a subdued voice cast a small healing spell on him. He smiled, but did not speak.
Susan could not stand the silence and heavy atmosphere, but she did not know what to do.

In the end Rósa broke the brooding silence: "We might as well compare notes on the lesson Thora was teaching us today. What ingredient did you write down as the wrong one? I had sea weeds as the odd man out form the list, but I think it's wrong. I could find no reason for it, and neither did I have a better suggestion."

Sanne, the girl from the Faroe Islands said: "I am sure stink beetles were wrong, why, I don't know, some stinky mushroom that I only know in Faroese is the right one."
"You forget that the language spell is still doing it's magic," Knud said with a lopsided smile. "Just say it, we'll hear it in our own languages."
"Stinkhorn," Sanne said.
"Of curse, Knud said, "that's the one."
"I agree with you as well," Susan said."Only I was in doubt that the solution could be this simple."

"But it is," Hilde said. "I know Stinkbugs are wrong because it is the stinking cloud recipe, and it calls for stinkhorn, not stinkbugs.  But I do not know why it should be wrong, only that it is wrong."
"Maybe because it was the only animal thing in the list?" Susan said. "All the others were plants or inanimates. At least that's what I wrote on my slip of paper."
"That's a good guess," Veronika said. "I think it's right."
"I think so too," Kirstin said. "I admit I had the wrong one, Sulphur, but after listening to you smart ones I think you're right."
"I had the same idea," Knud added, "only I never got to writing it down. I sort of forgot, but now I remember."
"Did you sit next to Marja?" Hilde had a cunning gleam in her watery blue eyes, and her plain face was almost beautiful from the excitement. When Knud nodded, she exclaimed: "I think I know why the Birch sisters were inattentive, and why Thora asked us to wash hands and mouths in the effervescent water."

"How do you know," Terje asked. "I only knew Stinkbugs were not right."

"I have been taught to use my brain, and I have studied hard even before I came here. Let's go to the library. I need to look in one of the books there. It is a big book, that's why I do not have it in my bag. Its size makes it very impractical."

In the library Hilde found a long, slim book. It would not fit into any school-bag. She quickly consulted the index, and found one of the dark yellow pages: "Listen here: 'Effervescent water, while normally not used for potions or philtres due to its bubbly, reactive nature, is an easy to use and efficient antidote to the effects of Deram Drops.' There we go. The Birch sisters have probably been using Dream Drops, and the effect had spread to at least Knud. That's why she asked us all to go and wash in the water."

"Erm, sorry." Knud said "what the bugger are Dream Drops?"

And the explanation for this, and Thora's lecture on the use of those
and teaching and learning at The Unicorn Farm will have to wait.