Hi all -
I've had similar problems as posted. Salt pills & gatorade is the best solution I've come up with so far. (Although, like Ben, salt pills make me feel a little ill.) Unfortunately, the best way to figure this out is experimenting on your own. I would think that salt needs would vary a great deal from person to person with cf. It's very difficult to drink too much tho...
One interesting note... I was reading up on this a few years ago and discovered somethign unexpected. Apparently, because we lose so much salt, we actually feel LESS thirsty that we ought to. This theory had something to do with how our brain estimates our need for water. Our brain recognizes a higher ratio of salts to water in the blood stream as "needs water", but since our sweat consists of a lot of sweat, this ratio in our bloodstream doesn't change as fast as for a non-cfer. Basically our brains are confused... That was a pretty poor explanation, I apologize, but it's interesting.
Best regards,
James