MSM

I've been taking the MSM for 6 days and I believe it has constipated me. Is this normal? Today my BM's were better and I've managed to have 2 everyday still, but their size has been really small and I literally had to work them out by going in circles with my body while sitting on the toilet. Again today was much better but I was just wondering if this is common. I've only been taking 1 capsule per day (1000 mg). I couldn't imagine taking it up to 4 times per day like the bottle says! Oh yeah, what are your thoughts about distilled water? I still don't know what to think about but I do know it makes me feel much better than the filtered tap water I was drinking. I just started drinking distilled again on Tuesday. Thoughts, comments? I've read good and bad and really don't know what to believe.

Nicole