Porter:
Things I gathered about Potable Water iodine tablets...
They lose power if exposed to light, so store them in the dark or in a dark bottle.
They iodine sublimates and gets all over everything if you don't seal them in glass with a teflon cap liner.
If you can store yours in a straw and suffer no degradation (they change color a bit) and no leakage (everything changes color) then you've got all the bases that I know of covered.
Bear
_________________________
No fire, no steel.