title_body: How hot should the water be for instant coffee?
upvoted_answer: There's an answer to this question at Seasoned Advice: see What water temperature should be used for instant coffee?
  
  A brief summary, taken from @PatrickSebastien's answer:
  
  
  Use water at whatever temperature you like to drink your coffee at, or
  Use water just below boiling, around 95-99 degrees Celsius (~205-210 F). 
  
  
  Other articles like this one from WikiHow also recommend using filtered water that is just off the boil.
  
  See also that same SA answer, and this question, for a discussion and additional context about how instant coffee powder is produced.