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I have a Shadow Cruiser Fun Finder Camper trailer. How do I fill the fresh water tank?? - fun finder camper

Is South-South Fun Finder T-189 P. w. I had to remove the hose connected with him and the taps off anti-freeze .... but I've forgotten how to get potable water tank to fill ... I need to use the bomb? Does anyone know? Perhaps it is very similar to other campers. I have a heater and a bypass valve. I could not run the water into the tank again. Any suggestions on this?