How much water should I drink daily?

The general recommendation is about 35ml per kg of body weight. A 70kg person should drink about 2.45L/day, but needs increase with activity and hot climates.

Does coffee count as water intake?

Partially. While coffee and tea contain water, caffeine has a mild diuretic effect. Count about 50-75% of caffeinated beverages toward your water intake.

What are signs of dehydration?

Common signs include dark urine, thirst, dry mouth, headache, fatigue, and dizziness. By the time you feel thirsty, you may already be mildly dehydrated.