Keep yourself well hydrated and you will not get constipation and in fact will probably be able to have bowel movement (pass motion) more than once a day. That is what happened to me.
At a period of time, I was troubled by constipation (having a bowel movement fewer than three times per week. With constipation stools are usually hard, dry, small in size, and difficult to eliminate. Some people who are constipated find it painful to have a bowel movement and often experience straining, bloating, and the sensation of a full bowel.)
I started to drink copious amount of water. I am at home in front of the computer at home most of the time so have access to the toilet at short notices and it is not rare for me to have 3 or more bowel movements a day.
There was a headline at BBC News - Health, Drinking over recommended limit 'raises cancer risks which troubled me. Huh? Drinking too much can cause cancer? But was comforted that the drinking in this case refer not to water but to alcohol.
However, be aware that there is another angle to drinking water - Why is too much water dangerous?. Apparently, drinking too much water can cause water intoxication - the brain swell and cause a headache and going overboard can cause death.
"Drinking too much can cause cancer