I've got a weak left knee, but with stretches before and after as well as drinking water it helps a lot. I can never stop having as part of my workouts. Running in the rain is an awesome feeling. I always wear Underarmor ColdGear pullover 1/4 zip with my rash guards underneath to keep the sweat off.
I've used Ascis for pavement and I recently got a pair of Adidas light trail running shoes for off-road.
I don't carry water with me just my ipod and my house key.
Also, a polarized pair of sunglassed help as your face reflects the sun from your sweaty face.
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