Not ready for winter...help!

Batwoman74

We are new caravanners and winter has quickly snuck up on us. I've noticed the forecast for temps tonight is 1 degree and we've still not emptied the toilet flush as we are going away in a couple of weeks.

Will it be ok or will it freeze if air temps are this low???  I didn't know if the carvan would insulate it a bit?

 

Thanks in advance

Elaine