Try hooking up the hose and tasting the water coming out of it. In the past I have noticed that some potable water hoses impart a strong taste/smell to the water until they have "seasoned".
Happy Camping! ///// Richard D.
2006 4x4 Ford 250 SD / 2007 Flagstaff 827 FLS
One very patient wife and one furry child who travels with us. Forty-two years of trailering and camping, and I still have a blast.