After exercising, chocolate milk is best. Ginger tea helps with nausea, sore throat and motion sickness. Different drinks work well for different situations and Greatist has a fantastic post rounding up what you should drink in any situation.
Here are a few samples:
To Lose Weight -- Green Tea/Grapefruit Juice
Turn to the world's most widely consumed beverage, green tea, which can help control weight by slightly enhancing metabolism (with four cups a day). Grapefruit juice has also been shown to have weight loss benefits, and eating ½ a grapefruit with each meal showed greater benefits than juice alone
For Constipation -- Aloe
If you're backed up, try aloe drinks -- aloe has laxative effects. A hefty glass of water with powdered psyllium (a plant fibre) can also help get you on the right track
To Lift Spirits -- Lemon Balm Tea
Lemon balm tea, herbs steeped in hot water, can chill us out when we're peeved. Teatime, in general, has been found to reduce blood pressure.
Each recommendation is backed up with citations to studies and reports by doctors or nutritionists, along with an explanation of why it's beneficial. Now if only it was an infographic we could stick on the fridge . . .
The Right Drink for Every Situation [Greatist]