The best replacement for water filter is water softener.

The best alternatives to water filter are rated as following:
★★★★★  water softener
★★★★  bottled water
★★★  purifier
★★  reverse osmosis
★★  water purifier
★★  softener
★  water cooler
★  brita
★  reverse osmosis system
  sand filter
  hepa
  iodine tablets
  pur
  berkey
  steripen
  pur water filter
  air pump
  iodine pills
  steri-pen
  dispenser
  brita water filter
  steri pen

Your alternative for water filter is not listed? Suggest!
Speaking about water filter, one probably shouldn't forget about faucet.

Other search terms related to water filter and their ratings are:
★★★★★ faucet
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Google Trends

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water filter
water softener
bottled water