As a health and wellness expert with a focus on hydration, I can tell you that the best thing to drink when you are dehydrated is water. Water is the most effective and natural way to rehydrate your body. It helps to replenish the fluids lost through sweat, urine, and other bodily functions.

In addition to water, oral rehydration solutions (ORS), such as sports drinks or electrolyte replacement drinks, can be beneficial. These solutions contain a mixture of salts and sugars that help your body absorb water more efficiently. They are particularly useful after intense exercise or during illness when you might be losing more electrolytes than usual.

However, it's important to note that drinking too much too quickly can lead to hyponatremia, a condition where your blood sodium levels become dangerously low. To avoid this, sip your fluids slowly and steadily.

Avoiding drinks with diuretic effects, such as coffee and alcohol, is also crucial when you're dehydrated, as they can increase fluid loss.

Lastly, eating foods with high water content, like fruits and vegetables, can also contribute to your hydration levels.

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Drink a rehydration drink, water, juice, or sports drink to replace fluids and minerals. Drink 2 qt (2 L) of cool liquids over the next 2 to 4 hours. You should drink at least 10 glasses of liquid a day to replace lost fluids. You can make an inexpensive rehydration drink at home.read more >>