Ask your parents to wash and dry the towels with the hottest cycles, if they have a sanitizing cycle use that. That should kill it. Honestly, if you do a once-over of easily contaminated surfaces with bleach you should be fine. If you're really worried, soak the cutlery and dishes in a diluted bleach solution for about ten minutes and rinse well. I did that when my roommate had a stomach virus last year and I didn't catch it. Yes, people can excrete the virus for two weeks, but keep in mind that after the initial bout of d* the virus won't spread easily from the toilet to the rest of the bathroom as it will mostly be contained in the stools.