Agree about gatorade powder being heavy. And bulky. I don't need the additives, get lots of nutrients from my food; my issue is that I tend to dehydrate, so want something to encourage me to drink more.
On long distance trips, it's not just about "what's best", but also about "what's available". In that context, crystal light singles or other brand or generic equivalents that can be found in a grocery store. Some are okay with the newer small plastic squeeze bottles, but I'd rather have the little packets --- I think lighter overall.
Generally I carry more than I need out of a town with a store that offers them, as a lot of times when I can at least minimally resupply food I can't resupply the drink powder, i.e., in gas station mini-marts and the like.