Vitalyte is recommended for rapid oral rehydration and electrolyte replacement, especially when minimal gastric discomfort is important as in strenuous or prolonged exertion, heat stress, exposure, shock, trauma, illness, malaise or fatigue.
Gookinaid Hydralyte has gotten a makeover and is now known as Vitalyte

Quart packet

Serving Size = 1 cup (234 ml) % Daily Value
Calories.................. 39
Protein.................... 0 g
Carbohydrate (as glucose sugar)....... 10 grams 4 %
Fat........................... 0 grams
Sodium.................... 69.3 mg 3 %
Potassium................ 99.7 mg 3 %
Calcium................... 2.0 mg 0.4 %
Magnesium.............. 1.4 mg **
Phosphate............... 27.3 mg **
Vitamin C................ 60 mg 100%