How long has it been since you sanitized your fresh water system in your RV? Did you know your fresh water system needs to be sanitized on a regular basis? Even with a good filter, algae, debris, and bacteria can build up in the fresh water tank and plumbing.
The sanitation process can take several hours, and will require access to a fresh water supply.
We have a Keystone Laredo travel trailer with a 43 gallon fresh water tank, and our water cabinet includes the fresh water fill inlet, fresh water tank vent to prevent overfilling, valve for switching between onboard water and city water, black water flush inlet, outside shower port, and the cable TV connections.