Someone with a '16 Seneca will chime in, but in case Jayco used the same Water Control Panels on Greyhawks and Senecas...
On mine, I flip the valves to Country Fill. And yes, I have a short hose that aspirates from a gallon jug where I have 2 cups of bleach in a gallon of water.
Insert the hose, Flip the pump on, suck it from the jug, then do a City Fill.
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