The best replacement for instant is active dry yeast.

The best alternatives to instant are rated as following:
★★★★★  active dry yeast
★★★★★  regular oatmeal
★★★★  instance
★★★★  active yeast
★★★★  brewed coffee
★★★  instantaneous
★★★  rapid rise yeast
★★  old fashioned oatmeal
★★  quick oats
★  netflix
★  regular rice
★  cook and serve pudding
★  old fashioned oats
★  cooked oatmeal
★  rolled oats
★  storage water heater
★  fresh brewed coffee
★  instant mtg
★  filter coffee
★  ground coffee
★  rapid rise
  regular yeast
  deadly poison
  steel cut oatmeal
  cooked pudding
  netflix streaming
  rapid yeast
  dry yeast
  active dry yeast conversion
  amazon prime
  steel cut oats
  slow cooked oatmeal
  old fashion oatmeal
  storage heaters
  slow-cooked oatmeal
  fresh coffee
  brewed
  rapid start
  instant

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Speaking about instant, one probably shouldn't forget about other.

Other search terms related to instant and their ratings are:
★★★★★ other
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Google Trends

Scale is based on the average worldwide traffic of instant in all years. Click on graph for more.
instant
active dry yeast
regular oatmeal