2. Thirst is first

3. Thirst is a warning that you are already dehydrated

4. Dark yellow-orange urine is another sign Urine should be a clear, light color unless

5. You’ve been taking medicine or eating foods that add color

6. Dry mouth and headache mean stop and drink soon

7. Dizziness and weakness indicate impending heat exhaustion – a serious problem

8. Dehydration also invites muscle cramps (especially the thin muscles on your back)

9. In cold conditions, dehydration greatly increases the likelihood of frostbite

10. You lose water quickly when you’re sweaty and working hard, even in cold weather

11. Less obvious is that you dehydrate drastically just standing still at high altitude or in any dry cold, let alone when exerting yourself That has been a factor in many mountain –climbing disasters