Here's what we used to do for boat shows when we wanted to display a working icemaker when we had AC power at the booth but had no water source:
1. Purchase a small garden sprayer (2 or 3 gallon) like you use to spray bug-killer on your roses.
2. Remove the sprayer from the end of the hose and replace it with a female garden hose connector. It may take a little jerry-rigging, but it isn't all that difficult to do.
3. Connect it to the solenoid valve at the bottom of the icemaker (water supply input). You can run it in from the rear of the machine if you wish, just like a conventional hookup. But for portability, it's best to do it from the front.
4. Fill the sprayer with distilled water, filtered water or simply fresh water from home.
5. Pump the sprayer as many times by hand as you can, to build up the pressure. Every few hours pump it again, maybe 8 or 10 additional strokes.
You'll get plenty of ice and you'd be amazed how much ice you can get out of your icemaker from just a gallon or two of water! The cubes will be a little smaller than usual, because you don't have as much pressure available, so it may be necessary to adjust the water level for the ice mold.
Each mold fill on a Raritan Icer-ette is approximately 140 cc's of water. This will make 8 cubes of 17.5 cc's per cube. A gallon of water is 3785 cc's, so at 17.5 cc's per cube, theoretically you can get 216(+/-) cubes per gallon of water. That's 27 batches at 8 cubes per batch, from a single gallon of water!
It worked like a champ, and you never had to worry about the ice tasting bad from stale water or cruddy lines. When you leave the boat to go home, take the sprayer with you. Rinse it out and store it dry until you return to the boat. It only takes a couple minutes to re-connect it when you come back to the boat.
