Water Cooler/Filtered Water

I believe the water cooler you describe would wind up being more of a "worry" and a "bother" then a "benefit". I don't know what kind of rig you pull now or your future plans but you might want to think more along the lines of a residential refrigerator with "door water", or perhaps a hot & cold filtered water system at the sink, perhaps an RO system. These are all stick and brick solutions however and, like your water cooler, not often found at campsites. What you do see more often are portable ice makers and campfires. Maybe some sort of solar hot water system might interest you?