Also,, start drinking plenty of fluids before you are thirsty and before you think you need any!!!
If you are drinking a lot of water and not peeing, then drink more, if your output is dark yellow or golden,, DRINK More.
I start alternating water, Gatorade, water, Gatorade etc... etc.... at 8am and don;t stop till I am back in the Truck headed for the hotel...
I would hate to see anyones weekend ruined by dehydration, heat stroke or worse,,, These HOT HUMID Carolina summers can get ya,,,
Charles