Why 21 days? It takes about 21 days to effectively make or break a habit. If you'll notice on the left side bar, I've added a section to update daily with my progress.
My current challenge will be to drink a minimum of 6 cups of water daily. I won't necessarily be eliminating other drinks from my day, but I want to start drinking more water every day. As it is now, sometimes I'm lucky to only drink a half a cup of water a day, if that.
Yes, I know you should drink 6-8 cups of water a day (at least). Yes, I know drinking more water helps your digestion & curbs your appetite. Eventually I'd like to get to a minimum of 8 glasses per day, but for now I will start at 6. 6 is still better than what I do now.