I know this is an old post but since I just read it for the first time I would like to offer my suggestion.
I do a lot of traveling and carry 4 blue 7gal water jugs. I also have a funnel attached to a 6 foot hose. I will look for a city park with a water fountain or a nearby school and use their water fountain. Though I prefer to go to a park first. Also many rest areas have a water fill area, and if not always have a water fountain or sink in the bathroom. I don't use this water for drinking, only shower, toilet and dishes. I prefer to buy my drinking water when on the road. I've been doing this since 1997 and have never been asked not to.
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