Relating to Wieght Loss?

Hi...I am 24 years old girl having weight of around 79 Kgs...I am taking fat absorb tablets i.e. Multi Vitamin, Cell u lose and Some other powder to be taken with Cold Cow milk in the morning instead of Breakfast and at night replacing my dinner...Ans I also drink 3 litres of water a day...My lower body is too expanded..specially thies and Buttocks...Will this Poweder along with 25 minutes fast walk would help me reducing the weight to the extent of 10 Kgs in next 3 months...I dont eat any sweets, choclates, ice creams and also bread...