I only exclude bread from my diet and I cut down 6kg from my body in 4 months. Normally working out... thats all. Btw fast cutting of weight is very unhealthy. It can get u all kinds of diseases like diabetis etc.
I only drink water intra workout. I think thats best. It is not good to consume anything while workout. Its bad for your gastrointestinal system. Eat and drink afterwards...