Over the weekend I had a chance to talk with the district health and safety person about oral rehydration mixes, and passed on the question about whether we should be emphasizing keeping a satchel of gatorade (or similar mix) with the first aid supplies.
His response was interesting. Basically gatorade at full strength is about 2-3 times more concentrated than it should be, and therefore can be quite a shock to the system. Basically it can make someone who is more than marginally dehydrated vomit and become worse, unless you dilute it or follow it with a lot of (clean, purified) water.
The non-sugar containing salt pills might actually be better simply because they would allow for slower salt uptake due to lower amounts of active transport. (you could always have a hard candy for the sufferer as a morale booster, and that would give about the correct amount of sugar at the more or less correct rate.)