I have a '21 Kodiak Ultra Lite 283BHSL and am needing to winterize it. I am brand new at this and my husband has totally no interest in helping...I am trying to do it properly as temps are getting cold and I don't want to have damage done.. I've emptied the fresh water tank and the septic has NEVER been used yet (no black or grey water produced). There was a bluish water in toilet when we got it, but it is now empty! Indicator lights on tank panel says fresh, black and grey tanks are on "E". Is it safe to say that I can add the RV antifreeze to sinks and toilet? Any help is much appreciated! I am inexperienced and running in the dark!!!