Why doesn't this have the same legal issues as Kinder Eggs? Maybe the watch in bottled water also can't be sold in the US?
1. This isn't US, so those rules don't apply ("a confectionery product with a non-nutritive object, partially or totally imbedded within it, cannot be sold within the United States")
2. This may be more a viral thing than an actual packaging.
3. The water may not really be meant to be drunk, it's just a gimmick.