You are going to get 2 different answers to this question.
Some of us ADD antifreeze to lines.
Some of us BLOW OUT the lines.
And BOTH of us believe our way is the best!:B
Here is what "I" do and have been for several years parking it in cold cold Wisconsin.....and of course I think it is the best way!
I add about 6 gallons of antifreeze to the fresh water tank.
I drain the hot water tank and put the plug back in.
I then turn the water on using the fresh water pump and turn on all the faucets/shower both hot AND cold and let them run until dark pink comes out and shut off. Then flush the toilet until pink comes thru that line also.
Take another bottle of antifreeze and add to toilet bowl, and then to sinks and shower to fill the p-traps. DONE
"I" think this is the best way because no matter how you blow the lines out there are low points that never get completely blown out AND blowing the lines out does not remove the water out of the water pump. Just come back here next year and see how many posts of, gee I blew the lines out but I've got broke lines, pump broke, etc.
And NO there is no anti freeze after taste in the lines. All you do is fill fresh tank and flush it out twice.
10 years below zero temps and no water leaks from frozen anything.
A mere 20 bucks worth of antifreeze is IMHO a small price to pay for piece of mind that you pipes will NOT freeze.