"I've had good luck with the Endurox R4 I got on closeout from Bonktown."
Whether or not one chooses to use a "recovery" drink, the type and amount of ingredients they generally contain can provide a template for what you should be taking in, regardless of the source, IMO/IME. Primarily carbs and protein in a 3:1 ratio, along with electrolytes. I am talking here about recovering from an extended hard workout or long, hard day on the trail. For shorter efforts it doesn't make that much difference because you haven't exhausted msucle glycogen or metabolized significant muscle protein.
@ Laurie - I have to disagree with your doc on the electrolytes, at least for endurance activities, especially in hot weather. I have personally had two serious incidents, during a marathon and a 50 miler, where electrolyte depletion was part of my problem. I also used to have frequent trouble with leg cramps, and since I started to add electrolytes to my water have experienced practically none. Maybe I'm a unique physical specimen, but somehow I doubt it. No doubt there are individual variences but, in the course of an extended effort, everyone loses Na in particular and, to a lesser degree, K, beyond what is ingested in a normal diet.