I would also recommend a water filter and/or water purification tablets. I have a Platypus gravity flow one that I used on the tap water in Honduras when I lived there. The water was probably ok, and I used it to wash my teeth, but if I was cooking or drinking it straight I filtered it. You can also get a pump filter (forget the actual name) that will take out everything in the water. These don't use electricity, but would make stream or 'non-potable' water safe.