title_body: What are good brewing practices?
upvoted_answer: The problem doesn't seem to be in your brewing practices but in the way you store your coffee.
  
  Roasted coffee starts to stale soon after the resting/degassing period ends. Ideally you ought to store your coffee in a vacuum-sealed container that won’t impart unwanted flavors to your coffee.
  
  Placing your coffee into the fridge, as many people do, isn't usually a good idea. The fridge is not cold enough to keep the coffee fresh and the coffee will absorbs odors and moisture.
  
  One solution, in addition to better sealing your coffee, would be to buy whole beans and grind your coffee before you use it instead of grinding a week's worth of coffee at one time.