Alacar (read Emergen-C) makes a replacement drink called Electro-Lyte which is sugar-free, mixes with water, has a very light taste and is very easy on the stomache. I either carry 2 bottles of that or put that in a CamelBack. Depends on what I'm doing and what the temp is that day!
Life should NOT be a journey to the grave with the intention of arriving safely in an attractive and well preserved body, but rather to skid in sideways, champagne in one hand, strawberries in the other, body thoroughly used up, totally worn out and screaming: "Yeah Baby! What a Ride!"