So I caught Jupiter drinking water. He stays like this for a long time as if trying to decide if he is really thirsty or not. Two sips and then he goes away. I have never seen little Nova drinking any water, though. I suppose she does, at least I hope she does. Sometimes I worry and place a few water drops around her mouth, but she only takes one or two.
I always give them mineral, purified water, however a time ago I encounter a person who mentioned that his brother has five leopard geckos and that he always has had many, so he just give them tap water. I could not give any opinion on the matter, but even if I had as many geckos as planets and stars in the galaxy to name them after, I would still give them purified water. One can never be too careful about tap water, especially where I live, and I do not want my geckos to get impacted from something as simple as that.