I have a 2014 and I just use a vacuum machine hooked up to shop air to suck the reservoir dry. Then I add fluid. The hose on the vacuum machine was about the average diameter of a normal straw.
You could also probably just remove the right side air filter housing that way you can unclip the reservoir from its mount. Then disconnect the lower line with a drip pan under it and drain the reservoir that way.
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Ford Diesel and Heavy Line Technician at your service. 
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