Well my Bp is given room temperature R/O water in his entire enclosure, his water dish partialy sits on top of his uth, so it gets somewhat warm, his swimming pool and fountain are in the center of his enclosure which is at an ambient temp of 82-84 degrees, so not exactly sure of the exact water temp. The most drinking he does is out of his fountain.
So I am going to go with "warm" as my vote.
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