Originally Posted by stapfam

If you are drinking that amount of water- you need it. Can't compute Ozs into volume but I drink about 1 litre of water an hour on a ride. Perhaps a little less in winter but 2 litres in the camelback and a 500ml bottle will last a 3 hour ride. What you could try is an Isotonic additive in one of the bottles to see if it helps.