I've been in construction for 20 years and have dealt with 8 hours of strenuous exercise too much. If where you are hiking has high humidity like we deal with in the Midwest, there are certain tricks I have learned.

If you wait till you are feeling the effects of dehydration, Gatorade or any of the other brands will only help a little. If you start drinking elecrolytes first thing in the morning, you won't hit that wall in the afternoon.

For years we would drink water all morning and then after lunch when we started feeling lethargic, we would start drinking Gatorade. I finally started thinking about it and realized what the problem was and now I can make it all day without hitting that wall until after I hit my easy chair at night.