The best replacement for sour is bitter.

The best alternatives to sour are rated as following:
★★★★★  bitter
★★  sweet
★★  sweet crude
★★  kush
★★  haze
★  bitter taste in mouth
★  slipknot
★  sweet game
★  tart
★  bitter coffee
★  haze jadakiss
  lambic
  sour mix
  amaretto stone sour
  sweet and sour
  sharp tasting
  bitter espresso
  whiskey sour
  duck sauce
  margarita mix
  more sour
  sweet candy
  sweet crude oil
  tyre
  amaretto sour
  og kush

Your alternative for sour is not listed? Suggest!
Speaking about sour, one probably shouldn't forget about disaronno.

Other search terms related to sour and their ratings are:
★★★★★ disaronno
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Google Trends

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sour
bitter
sweet