The best replacement for strong acid is weak acid.

The best alternatives to strong acid are rated as following:
★★★★★  weak acid
★★★  strong base
★★  weak base
★  concentrated acid
★  weak acid titration curve
★  weak base titration
  weak acid titration curves
  weak

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Speaking about strong acid, one probably shouldn't forget about strong base.

Other search terms related to strong acid and their ratings are:
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★★★★ weak base
★★★ weak acid
★★ weak base titration
★★ weak base titration curve
★ weak base ph
★ base
★ weak base reaction
★ strong acid
★ buffer
★ strong base titration
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strong acid
weak acid
strong base