Puckster wrote on Jan 12^th, 2011 at 1:38am:

I used to feel nauseated for the first day or two of many trips....until I realized I was dehydrated.  Now I chug lots of water, and haven't had symptoms since. Prouboy

You can't over stress the importance of staying well hydrated when your doing any kind of exercise/work.  Dehydration can cause mental confusion/loss of focus, not good when your reading a map or contemplating pushing on in risky situations.

Simple rule, drink till you pee clear. Works unless your taking meds/vitamins that might color you urine. Then you need to look for enough volume on the outflow ;)