Chlorine or iodine based tablets will corrode (read, react with) aluminum. It might be OK for a few days, but not long term. If you can find a real small Nalgene lexan bottle it is light, airtight, durable, and chemically inert. Also, small plastic vitamin bottles work well. Put some clean cotton in there to damp out tablet shattering rattling about. It can also be used as tinder in a pinch.