title_body: Brewing Coffee with instant hot water tap
upvoted_answer: Is it, by any chance, demineralised/distilled water, with no minerals added back in?
  
  Aside from temperature (which you should check - it's OK if it's cooler, but too cool is no good, and knowing the temperature will help you modify other parameters), it's important to have high quality, odour-free water that is free from impurities and that has the correct mineral content. The SCAA actually specifies water standards (see here). In many developed parts of the world, tap water is fine. However, demineralised water is NOT fine. It will underextract.
  
  One solution*: Buy bottled mineral water (like Evian or a cheaper alternative), which usually has too HIGH a mineral content, and blend it with the filtered water from the dispenser. This may seem hard core, but it'd be good as an experiment to see if it cures your woes.
  
  
  Joke only intended after the fact