I am constipated and haven't had a bowel movement in nearly a week. tried drinking more water. what else can i do to help myself go?

First of all: Go on a liquid diet until you are completely emptied avoiding caffeine and alcohol. You can use glycerine supposoitories in the rectum every 6 hours or a fleet mineral oil enema to loosen stool from the rectum and milk of magnesia (magnesium hydroxide) 1-2 tbsp every 12 hours until cleared. Then to prevent be sure to drink 80-100 oz of fluids daily, caffeine free/alcohol free.