Mostly IBS diarrhea is in the soft to loose stool range. Watery diarrhea can happen, but sometimes indicates something else is going on, especially if most of what you pass is watery diarrhea especially for days or weeks on end rather than once in awhile with other consistencies in between.Sometimes it is just the IBS acting up, but for me when it lasts longer than an hour or so watery diarrhea usually ends up being a GI infection that would cause repeated episodes of watery diarrhea in anyone.Unfortunately having IBS doesn't prevent one from eating some food that may be a little off or picking up a GI virus.If you start having watery diarrhea as a consistent pattern you might need to get that checked out.