Hydrate, Hydrate, Hydrate

I went on a simple 4 mile run today. The day before this routine run, I drank about 24 oz of water. On a typical day, I try to consume at least 120oz of water.  By mile marker 2.5... I was beginning to feel the affect of not consuming enough water. I didn't bring any water with me on this run because it was only 4 miles. I had dry mouth, and calf cramping. I stayed on course and finished my 4 miles in 34 min. However, I am still paying for the lack of hydration. My advise to you would be to hydrate, hydrate, hydrate both before... and after your runs!