The best replacement for dehydration is hypovolemia.

The best alternatives to dehydration are rated as following:
★★★★★  hypovolemia
★★★★  hydrolysis
★★★  volume depletion
★★  condensation
★★  heat exhaustion
★  overhydration
★  condensation reaction
★  hunger
★  hyponatremia
★  canning
★  uti
★  hydrolysis reaction
★  fluid volume deficit
★  starvation
★  acute renal failure
★  drying
★  hypoglycemia
  heat stroke
  renal failure
  bladder infection
  low blood sugar
  hyper hydration
  siadh
  dehydrated
  gatorade
  fluid overload
  kidney failure
  heart rate
  volume depleted
  fvd
  heat exhaustion symptoms
  preeclampsia

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

Other search terms related to dehydration and their ratings are:
★★★★★ hyponatremia
★★ hypernatremia
★ edema
electrolyte imbalance
You have in mind a companion for dehydration and it is not yet here? Propose!



Google Trends

Scale is based on the average worldwide traffic of dehydration in all years. Click on graph for more.
dehydration
hypovolemia
hydrolysis