Charlie filled a empty plastic bottle with water from the river, and took it into his house.
He poured some of the water into a cup, making sure to filter out any dirt in it, and put a sterilizing tablet into the cup, and let it dissolve.
"Down the hatch!" he said.
He took a sip.
Nothing.
He took another sip.
Still nothing.
He took a bigger sip.
Still nothing. This was going to take forever.
So, without a second thought, he gulped the whole cup down.
he felt a tingle in his body. the tingle spread from his head, to the tips of his fingers, to the ends of his toes.
"I think something's going to happen!" Charlie said.
And he was right.