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Something I've learned over the last couple of years, when winterizing my travel trailer, if you have a portable electric air pump you can blow out "ALL" your water lines ( take your time doing this I would suggest at least 10-15 minutes per line) then just pouring about 2 good cups fulls of RV Anti-Freeze ( I would reccommend 40 below anti-freeze) down ALL the drains. Both sides of the kitchen sink, the bathroom sink and the shower/bathtub ( personally I put some down the toilet as well but thats up to you). If the lines have no water in them then what is going to freeze? AIR, right. You blew them out already right, so why would you want to fill them up again with another liquid?