I didn't use them as I ended up buying a new bottle in the end but did think about using baby bottle sterilising tablets on an old one I have where baking soda hadn't done much of a job.
Not meaning to make this into a sales pitch for Camelbak Podiums but I've only recently managed to change my bike set up to be able to carry 2 bottles and only have one of them, I though the thermal one didn't work and was a marketing ploy until using one directly after a non Camelbak on the same ride which made me realise they do actually work and I must admit the nozzle is way better to drink out of than the others which seem to leak down the side.
Think you can get an extra chill one so may look at getting one of those as well .... doesn't half beat drinking water that's still slightly chilled rather than something that's sat in direct sunlight for 3 hours and got warm.