The 'water' is an indication that fecal material is moving through your colon so fast that it doesn't have a chance to absorb water from it...be careful because if this continues it can lead to dehydration and electrolyte imbalance...same as it does with prolonged diarrhea. You might want to cut back on F1 a bit until you start taking the F2...also make sure to drink extra water and replace lost electrolytes.