How long can you store tap water in containers and what would you use to refresh that water to make it usable?

I ask this because our state is short on water and I have many bottles of tap water stores in case of hurricanes. The water has now been there one year. I heard that plain clorox or tincture of iodine can be added to make the water drinkable but I don't know which of the two is the safest to use, nor do I know where I can buy tincture of iodine. Your thoughts please.