Not having diarrhea is not the same as being constipated, but it may feel that way to begin with. Perhaps you might be a little constipated, and then it is time to reduce your dose to suit. No-one else can tell you. Chances are you are dehydrated if you don't. Unrecognised chronic dehydration is a major health problem.
Some people count coffee, tea, colas and fruit juice as water.
They are not, and in most cases they will dehydrate you even further. Your cells need water, pure water. Warm or hot water is best, but that's a personal choice. Any water is better than no water. Ibsacol has reportedly caused a headache in some people that always has been remedied by drinking more water.