The water system of an RV has many similarities to the one in your house. They both need a source of potable water supplied to them. This water source in turn supplies water to the water heater, the kitchen sink, bathroom sink, shower, and toilet. In your house the waste water that goes down the sink and shower drains, and the waste flushed down the toilet goes into a septic tank or a city sewer system.

Your RV has two waste water holding tanks similar to a septic tank. The gray water tank collects waste water from the sinks and shower. The black water tank collects waste from the toilet.

There is a monitor panel in the RV that will allow you to check the tank levels so you will know when they need to be emptied.

I mentioned a moment ago that you need a source of potable water for your RV. Most campgrounds will provide a potable water source to hook up to. You just connect a potable drinking hose from the water source at the campground, to the city water inlet of the RV and you have water supplied throughout the RV