I was just wondering what the difference between iodine tablets and iodine droplets (obviously ones a tablet and another a liquid :P ).
I have only used the tablets as that is the type my mate brought on a hike that we did. The only thing I can think of is that the tablets are easier to use, but they can be rather fiddly especially with cold hands. The droplets work out cheaper as they can be used to purify more water.
Tablets don't leak away if you don't screw the top up tight or if the cold contracts the bottle more than the top. At night we put hot, boiled water into a Sig bottle and put the iodine tablets in and then put that in a sock or it's own neopreme jacket and used it as a hot water bottle. By morning the tablets were definitely dissolved. At first we used other tablets to neutralise the taste of the iodine but then realised it wasn't a strong enough taste to need to get rid of.
Kitchen boys brought the water in a kettle and we weren't sure how long it had been boiled for. If it wasn't long enough, not all of the bacteria would have been killed. Having picked one stomach upset up from a meal in Kathmandu I wasn't prepared to risk another!