Interesting you ask this today, since I spent a good bit of time yesterday looking for it.
I found some of the premade liquid containers at the grocery store, nobody seems to have the powder (including many online nutrition stores). I guess since carbs became evil, carb powders became evil too. It's a pisser when yo'ure trying to carb-load.
Kool aid is primarily sucrose, it is not a good replacement for Ultra Fuel (predominantly glucose, glucose polymers with small amounts of fructose).
You can order bulk maltodextrin (glucose polymers) from Kilosports. Powdered fructose is dirt cheap at any health food store.
http://www.kilosports.com