Hi! I am thinking about stocking some food and water just in case the situation might get worse or there might be an inflation but I have a lot of questions. Hope you guys can help me out. I went to the supermarket today and checked out how long most bottled waters stay fresh and most of them only stay fresh like 6 months. What happens after they are expired? Is the water no longer useable? Do you get bacteria in it? And could this be reversed somehow through any of those tablets which clean the water? There are various of them which you get at outdoor shops. Do those tablet clean any water even rain water which you collect? You just throw in a tablet and then you can drink it without concern? But what kind of tabs do you need? There are different products and I don't know what I should look for.