Winter camping with no electric

[Mainemoosepies]

Hello folks! This section is pretty thin! I not only camp in the extreme cold I do so with no electric or water typically in a coleman popup hehe. We have a recently acquired a TM but I am not too experienced with how to use the plumbing. While the camper will be in a particular location for the next few months it will not always be occupied. Are there any other tips for keeping the grey water from freezing? I am mostly concerned about the potty. I have an old porta potty that has been modified as an outhouse but it sure would be nice to use the one in the camper! I read in one thread someone used a salt solution. Could that be used in the recirculating toilet? Would it dry out the seals? Items we typically have with us is a buddy heater and generator. I really have no intention of using running water just the potty but I don't want to chance having the tank freeze. Primative camping in the cold is not new to me however in a a TM camper is...so any tips would be welcomed.