This especially helps kids. It is also my understanding that since iodine will kill viruses, if that is a concern, you might want to use the iodine then run it through a micron filter. Filtration Filters may be used for Giardia and other protozal cysts, enteric bacteria and parasite eggs. Most commercial mechanical filters claim removal of Giardia and bacteria. Claims for virus removal cannot be substantiated well.
Some filters incorporate iodine resin or charcoal filter.
Most of these filters will take the chlorine and some metals out of water to make it taste better but do not filter out the bacteria. Do not rely on this type of water if you are at all uncertain of the quality of the water. They are the best way to ensure that water is okay to drink and won't make you sick. Unclean water poses a risk for gastrointestinal and other problems. If you are concerned about having enough water, one idea is to get one of those above ground type swimming pools you can get at places like Wal-Mart or Kmart.