Hydralyte Hydralyte is scientifically formulated to replace water and electrolytes lost due to vomiting? diarrhoea? heavy sweating and vigorous exercise. It contains the correct balance of electrolytes and glucose required for rapid rehydration.DirectionsPlace Hydralyte Ice Blocks in the freezer.When frozen? cut open one end with clean scissors.Push the frozen ice block from the uncut end.Suck small amounts until consumed.Hydralyte Ice Blocks may be consumed unfrozen.IngredientsSodium Chloride? Potassium Citrate? Citric Acid? Glucose