In the medical field we too have volative aromatics that permeate most plastics if not metals in time-example nitroglycerine tablets...so I would recommend a cheap way to repackage the Portable Aqua is to obtain the mini-bottles of nitroglycerin for sublingual use and replace the tablets with<br>the iodine tabs from the larger Portable Aqua bottle, the inner lid of the nitro bottles have what i believe to be teflon already in place, but if in doubt and I suggest you confirm this, then teflon tape is easily found in the plumbers section of most majore hardware stores like Lowes or Home Depot...quite possible a relative may be on this med for angina...the bottles fit easily into my tobacco tins and also my small Otter box that is permanently affixed to my PFD.<br><br>