I have winterized my trailers both ways with and without antifreeze in the water lines and have not had any problems. What I recommend, if you choose not to use the antifreeze, is to blow out the lines several times (waiting at least 1/2 hour between times so water will recollect in low spots) to ensure all water is removed. You must use antifreeze in your traps and holding tanks as it's impossible to completely drain them.
If you have the winterizing bypass option on your unit, I would recommend using the antifreeze method for wintering the water lines....it's very easy to do and just seems safer.
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