Can anyone tell me how to remove the "plasticy" taste from the drinking water in my `van. I have had a number of vans over the years, the last two were brand new. I always flush the system and water container at least yearly.I have used Milton and Purecleans. I renew the filters. I tend to now fill a separate container from the Site tap just for drinking water and for Tea. I observe that many others on site do the same.