To the OP - I can repeat the advice above, as I have that exact same compressor. One of the smaller ones that you get for air guns would do fine (3-5 gallon range)
In my case, I pumped the 20gal up to 140psi, unplugged it so I could wheel it out to the camper, and when I was all done blowing out the lines I still had 90psi left (I had the pressure regulator on the hose set to 30psi sustained)
As I'm a bit paranoid about freezing, I still put antifreeze in the lines.
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