Winterizing water lines

Thanks for the quick replies. Don't have to worry about hot water tank, it rusted out and already bypassed. I live in Kentucky and last year we had a cold winter and one line did burst. I read also about using a hand pump and putting it thru the hook up for city water, you know where you hook up a hose to the outside of the camper. Maybe this might be easier than hooking up a longer hose to the pump. Any advise about that way.
Also, I have never blew the lines out, but I do have what looks like the attachment that you use to blow the lines and I have an air compressor. I know I have lots of questions. Im trying my best.