Today's tip is a quick and easy one. I don't remember where I first heard or read about it.
Hydration/energy drinks are great when you are riding, but they can be expensive.
Gatorade and Powerade are cheap, but they are lacking in sodium (they only have 25 mg/serving).
What you do is buy a can of powdered Gatorade mix, and when you mix up a bottle to take on your ride, add about 1/8 tsp of salt to the bottle. That will give you the necessary sodium to replenish what you are loosing through perspiration.