I purchased a set of these from US Cavalry for only $10. I needed something to get the plastic/rubber taste out of my Camelbak reservoir so I could actually enjoy my water. I tried soap, a baking soda solution, and lots of water but nothing worked. I finally tried one of these tablets and it did just the trick. I highly recommend buying a set (8 tablets) of these especially if you like to put Gatorade in your Camelbak.

I didn't buy the Camelbak dryer because you can just use a clothes hanger and the brush can be replaced with some pipe cleaner found at most hobby stores. Make sure you dry your reservoir completely before putting it away for storage.