Quite right Sooz. I was involved with 'that' study (or a similar one, Canada) and what we did was analyse the water from bottles kids had with them at school. They had bits of things in them that might well have caused health problems -- anything from yesterday's breadcrumbs to this morning's boogers -- so the warning has to be, as ever, err on the side of best practices. If you want to sterilize plastic bottles give them a good rinse in hot water then add a couple of drops of iodine in half a lite pf tap water, slosh it around, discard, rinse and fill. You'll be just fne. Unless you live in Waterton ;o)