Hi all, someone can you help me out. I was wondering how long will the water stay fresh in a C/T poly tank - firstly, When full to overflowing and 2ndly only 1/2 full. We are going away soon (4 weeks) and camper has been sitting with a full tank for a few months. Will taste test but a bit of reassurance so I don't empty the tank will help. Tank water will be used for cooking,washing up, and showers. Usually we carry drinking water in seperated containers in the vehicle but may still use tank for drinking if we run out. Will be doing alot of bush camping.