Lately it's come to my attention NOT TO REFILL A TYPICAL WATER BOTTLE OR 2-LITER BOTTLE.
If a plastic is marked on the bottom (in a triangle, hard to see,) by the number "1" (or "1 PETE"), it is for ONE TIME USE.
Which means whatever bottled water you buy, DO NOT REFILL the bottle, toxins can settle inside.
In fact, the only safe plastic to use for refill is the "2 (pete? I'm not sure)" which is common on milk jugs.
So in case of apocalypse, use milk jugs.
