By far the most hassle-free filters are the kind which are housed within your refrigerator’s water dispenser. Should you don’t have just one of such, try a Brita or Pur filtered water pitcher Even the Keurig website states that “Bottled or spring water works best when brewing with your Keurig.” https://finnmvelt.59bloggers.com/20236016/pouch-of-water-options