On long rides, or really hot days 90+ degF, I have one 24 oz bottle with water and another with sport drink. If you use the powder it's really cheap. I occasionally sip on the gatorate to replenish lost electrolytes and it has a little sugar in it for fuel. Generally, the straight water is more satisfying to sip on. After hot rides my helmet strap is caked up with salt. This is normal. If this stops after heavy sweating, then you have problem.