Has anyone else tried this? My friends hang out in India alot and claim they have never had any problems getting sick by purifying their water this way. I have done this back packing and never had any problems either. I take a gallon of water from the stream and put a few small swimming pool chlorine chrystals in it,(fewer chrystals than the size of my small finger nail) shake it up until disolved, let it sit an hour, then add 5-7 drops of hydrogen peroxide to your water and shake again, let sit a couple of minutes and you have good, safe drinking water. My friends also add a couple of drops of hydrogen peroxide to street food they buy in India and claim they have never gotten sick from food by doing that.