From the neurological perspective, the three most important things that humans do are: 1) walk; 2) talk; & 3) swallow.  They are all super complicated. Dysphasia: difficulty swallowing.  Water is the most difficult thing to swallow, so drinking water will not help, only prolong this condition.  Where is Hillary's neurologist?  Did he have a Labor Day vacation?    

Hillary Clinton Started To Cough Violently In Cleveland, Ohio

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MSNBC Cuts Live Coverage As Hillary Has "One Of The Worst Coughing Fits Ever"

http://www.zerohedge.com/news/2016-09-05/hillary-just-had-one-worst-coughing-fits-ever-msnbc-cuts-away

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Later on that same day on her plane (wearing same clothes):

Hillary Clinton's Coughing Fit Ends Press Gaggle on Plane

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Information about frontotemporal lobe disorders, dystonia, and swallowing abnormalities:

https://www.nia.nih.gov/alzheimers/publication/frontotemporal-disorders/types-frontotemporal-disorders

http://www.dystonia.org.uk/index.php/about-dystonia/types-of-dystonia

http://www.asha.org/public/speech/swallowing/Swallowing-Disorders-in-Adults/