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I think, these translations would be best:

•chilled water = kaltes/gekühltes Wasser (gekühlt sounds a bit better)

•ambient water --> there are multiple possible translations:

  • raumtemperiertes Wasser (this is an official word by producers of water dispensers)
  • ungekühltes Wasser (like you already said)
  • laues Wasser

•hot water = warmes/heisses Wasser

Hope I could help you.