The best replacement for deionized water is distilled water.

The best alternatives to deionized water are rated as following:
★★★★★  distilled water
★★★  tap water
★★★  reverse osmosis
★★  purified water
★★  distilled
★★  reverse osmosis water
★  demineralized water
★  soft water
★  ionized water
★  ro water
  double distilled water
  reagent grade water
  ionized
  softened water

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deionized water
distilled water
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