Thanks Turbs, youroo and raspivey. Yes I'm sure my dealer showed me but I am a total novice and we covered a lot of ground in that hour. I drove from Little Rock to Albany to see Niagra and get the camper 5k cheaper than in my home state. The local dealers are not that happy with me and when I call for a question I'm told "when it breaks down don't bring it here for warrantee work." much less answer a stupid question.
Unfortunately the dealer did not have a manual for this unit so I accessed this site and watched all the videos which added to my confusion. I thought the port you have kindly pointed out was the drain for the sink they talk about in the on line information. I have two hose screw on ports in the back, one for pressurized city water and the other has a sticker that says something about winterizing with antifreeze. I have one valve in the outside compartment in the rear near the water filter and three in the hot water compartment. I have been turning valves and screwing on hoses like mad and have tried every combination and permutation of hose ports and valve positions possible but the little light on the control panel still says the tank is "empty." Now that I have carpal tunnel syndrome I am elated to find out I can just squirt water down the funnel I thought was the sink drain. I've taken four trips so far and I love this little unit with all the perfectly functioning systems despite my inept and inadequate operation.
Unfortunately my wife still prefers the Marriott hotel. That may have something to do with the severe lack of onboard water on our recent trips. Sponge bathing with the water out of a 4 ounce bottle just isn't her thing. Thanks a million for your help. I'm sure I'll have lots more questions as time goes on like how do you get the murphy bed back up after you get it down. It is now convenient for quick roadside naps. Take care.