For $10 one gets 20 "Bottle Clean" tablets. All you do is fill you’re your SIGG bottle with warm water and drop in one tablet. Let it sit for 30 minutes then rinse it out. What my guess is that the tablets do, is gently bleach the inside of your bottle to aid in both possible discoloration and fight off germs and bacteria. (See my other posts to understand why SIGGs are great).
SIGGs also come in small sized bottles for kids. They come printed with fun designs and flip tops to avoid spills.
Lily Lotus (kaimuki; lilylotus.com)
Whole Foods (kahala)
REI online (rei.com)