Fern,
Welcome to the forum!
The easier way to get antifreeze in is with an external pump through the city water connection. I have small electric pump is use to move water from a bladder when we are out boondocking.
The other option is to just blow your lines out which takes a compressor and an adapter that screws into you city water connector - set your air pressure not higher than 60 PSI and then open faucets, toilet and other water connections one at a time to blow water out. Would also pour a little antifreeze in your traps and toilet.
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Zack and Donna plus Millie and Ranger
2018 3160RL
"Life is too short to stay indoors, enjoy the ride!"
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