The best replacement for hydration is hydrolysis.

The best alternatives to hydration are rated as following:
★★★★★  hydrolysis
★★★  dehydration
★★  water absorb vaporeon
★★  gooey
★  hydralicious
★  moisturizing
★  moisturization
★  hydrogenation
★  tresemme naturals
★  gatorade
★  totally twisted
  moisture
  sap sipper
  aussie moist
  camelbak
  long term relationship

Your alternative for hydration is not listed? Suggest!
Speaking about hydration, one probably shouldn't forget about cisplatin.

Other search terms related to hydration and their ratings are:
★★★★★ cisplatin
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Google Trends

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hydration
hydrolysis
dehydration