Bauer, I'm not a big fan of Calorie-containing drinks during a workout (unless they're necessary -see below).
Scientifically speaking, we've seen that drinks consumed immediately after a workout result in 30% lower protein synthesis rates, compared to when the drink is consumed an hour later.
Whatever the cause, the impaired benefits would be similar to those seen wehn a drink is consumed during the workout.
In other words, you're getting half the benefit from a pre-workout drink, and half of the reduced benefit from a drink consumed immediately post workout.
Not-so-scientifically speaking, no matter how much I dilute the drink, I always feel that it's too think during my workout.
Having said all of that, when people first begin pre-workout supplementation, I always suggest that they have a carb-containing beverage on hand, just in case their blood sugar crashes.