今日はどれだけの水を飲むべきだったか

Most adults should aim for 8 glasses (about 2 litres) per day as a baseline. Active people or those in hot climates may need 10-12 glasses. Listen to your body and adjust based on thirst, urine colour, and activity level.

Yes, moderate coffee and tea consumption does contribute to your daily fluid intake. While caffeine has a mild diuretic effect, the water content more than compensates. However, water is still the best primary hydration source.

Common signs of dehydration include dark yellow urine, dry mouth, fatigue, headaches, dizziness, and reduced concentration. By the time you feel thirsty, you may already be mildly dehydrated.

Yes, overhydration (hyponatremia) is possible but rare. It occurs when you drink so much water that sodium levels become dangerously low. Spread intake throughout the day rather than chugging large amounts at once.