I am looking for advice on setting up the freshwater tanks for the season to keep the water as fresh as possible. I apologize if this has already been posted but I have been searching and have not been able to find a post. We have the water tanks winterized now and I'm looking for the steps to take to flush them out so that the water will be fresh. I am assuming that the water is not used for drinking, is that a correct assumption?Thank you for any advice.Joanne