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Ram's answer is petty much on target. In general, they should have access to water. But many species bathing is a separate need from drinking. And as long as certain needs for that species are met, it doesn't necessarily have to mimic it's natural habitat. But again, allot of this varies with different species.
From what you said, I would guess they're taking about a large lizard, a monitor, argentine tegu, green iguana. There are many people who will let them free roam a house, with an area set up they can bask in, and they can do well.
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