Dedicated rehydration drinks are the best beverage to combat dehydration, notes WebMD. A home recipe for such a drink takes a quart of water, 1/2 teaspoon table salt and 6 teaspoons of sugar, although this drink is best for adults and children over 12 years of age.
Immediately after suffering dehydration, it's necessary to consume 2 quarts of cool liquids such as sports drinks, water, juice or rehydration drink over the next two to four hours. After that, drinking a minimum of 10 glasses of liquids each day is necessary to restore lost fluid levels. Rest is also helpful, especially during the first 24 hours after dehydration, reports WebMD.