The best recovery drink is water. It's effective and, at least where I live, free -- it comes out of a tap.
There's no need to drink anything special after exercise particularly if you want to lose weight, unless your training is extremely rigorous, or unless you don't expect to eat much before you exercise again.
If anyone can show me any reliable, scientific trials that show any kind of benefit at all for electrolyte or protein drinks, I should very much like to see them. I think it's all a con.