is good for you, but don't get dehydrated like that. The more you do it, the stronger and fitter you'll get. One bottle to one liter/hour is decent fluid consumption in hot weather. Make sure you have that capability. Watch your forearms. Don't let them get dry. A heart rate monitor is a good tool. If your HR gets unusually high for the effort, you're dehydrated. If you do get dehydrated, find a water source with shade. Sit and drink until you pee.