The best replacement for sodium chloride is calcium chloride.

The best alternatives to sodium chloride are rated as following:
★★★★★  calcium chloride
★★★★★  potassium chloride
★★  sodium hydroxide
★★  sea salt
★★  rock salt
★★  sodium
★★  bacteriostatic water
★  magnesium chloride
★  sodium bicarbonate
★  table salt
★  normal saline
★  sodium carbonate
★  sodium acetate
★  sulfates
★  lactated ringer's
★  sterile water
★  lactated ringers
★  sodium citrate
  sodium chlorite
  epsom salt
  sodium nitrate
  sodium iodide
  sodium hypochlorite
  common salt
  hartmann's
  sodium lactate

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Speaking about sodium chloride, one probably shouldn't forget about silver nitrate.

Other search terms related to sodium chloride and their ratings are:
★★★★★ silver nitrate
★★★★ aqueous silver nitrate
★★ potassium chloride
★ silver nitrate equation
★ potassium nitrate
★ lead nitrate
★ lead ii nitrate
★ concentrated sulphuric acid
★ iodine
mercurous nitrate
botox
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sodium chloride
calcium chloride
potassium chloride