The best replacement for silica gel is calcium chloride.

The best alternatives to silica gel are rated as following:
★★★★★  calcium chloride
★★★  activated alumina
★★★  alumina
★★★  clay desiccant
★★  molecular sieve
★★  silicon dioxide
★★  silica sand
★  desiccant
★  oxygen absorbers
★  florisil
★  fumed silica
  drierite
  activated carbon

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silica gel
calcium chloride
activated alumina