Anamoly scan - tips?

A.S
Hello! I am scheduled for the 18 - 20 week Anamoly scan soon. My docs going on a vacation so, she is doing it sooner than later. 
Anyways, this is my first Anamoly scan. And I was wondering if you all could share tips on what I can to before the scan. 
Someone said, drink water. Any other handy tips? I am scheduled to see her at 11am. 
Thank you in advance and wish you all a great thanks giving! 

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