Thank you all for the words of encouragement! Need it after last night. Finally got to the water systems.....
Lesson #86 when you buy a used rv: Make sure all water connections are hooked up! Started filling the fresh water tank to clean the system, only to find water pouring out under the motorhome! There is a T-connection under the sink where the pump is, and the inlet tube to the pump wasn't even connected to it! Water just happily pouring out of the connection. Sopped up what we could, and ran home to grab a fan to dry out the rest.
Got that taken care of, then started running the bleach water through the system. Put a little bit of bleach in the hose and hooked it up to the city water connection to clean that as well. Went back to the pump, ran some more water. Found out we have a small leak at the toilet. Small leak, and about 95% of the water drops down onto the black tank, but a little stayed in the bathroom. Get to pull that and see if it is just the inlet hose, or if something on the actual toilet is broken. Not looking forward to trying to get around that toilet, absolutely no room. Makes me think they put the toilet in before they even put up any walls!