Still no instant cure for the common cold

Pia caught a cold from Sammy, who caught it from Dominic, who brought it home from school. 

The runny nose bothers Pia, so Mommy told her to drink lots of water so she'll get better. 

So she pours water in her tumbler and drank.  After drinking:

Pia: Mommy, I already drank lots of water

Mommy: Good.

Pia: But why does my cold still not go away?

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