I guess the question is, how can one really prepare? Other than the usual, stay away from others who are sick, go to the Dr. if you feel like you have the flu, cough into your elbow, wash your hands?
I think some people are inclined to carry on with their lives (including travel to WDW and elsewhere) while following these simple precautions. Others are probably thinking of going to
Walmart tomorrow and stocking up on bottled water and canned goods, not wanting to send their kids to school/go to work. What is the best way to prepare???
At this point it's all fear and speculation. Until they tell me to stay in my home until this blows over, all I can do is hope for the best (use hygiene, obviously) and live my life. If this is going to kill us all, then we are already screwed.

Sorry.