Remember - most fat-burners have a mild diuretic effect on the body. (. your body tends to lose water) You should strive to increase your water intake in order to compensate (unless you're preparing for a contest). Water plays an important role in transporting nutrients to muscles and shuttling waste out of the body. 1 - 2 gallons of water a day is recommended for most bodybuilders. Also, take thermogenics with more than just 8 ounces of water. That's the bare minimum that your body needs to swallow the stuff! I suggest taking at least 20 -24 ounces. That way, your body will remain hydrated, which is even more important if you use them pre-workout.