The best replacement for metabisulfite is star san.

The best alternatives to metabisulfite are rated as following:
★★★★★  star san
★★★★  potassium sorbate
★★★  campden
★★★  campden tablets
★★  potassium
★  sodium metabisulfite
★  sodium bisulfite
★  sulfur dioxide
  sodium thiosulfate
  sodium metabisulphite
  potassium metabisulfite
  bisulfite

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metabisulfite
star san
potassium sorbate