You really don't need to worry about the pup ingesting the plastic from the bottle. When they are teething, their little puppy teeth usually pierce through the bottle and they have a "little struggle" to get them back out. This produces a massaging effect on them to help with the teething process. They also end up scooting it around quite a bit. Just make sure you remove any part of the bottle that could accidently hurt the pup such as the label and bottle cap. ALWAYS supervise puppy play and when the bottle becomes full of holes and to the point where there may be some jagged edges, throw it away and give pup a new one to start on!

About the sand box.... ingesting a few sand particles is really no different than ingesting the dirt they get all over their mouths when they dig in the dirt! The idea behind the sand box is just to control where they dig so you don't have little holes all over the yard. Please note that you should not introduce a sand box to your pup unless he is an out of control digger. Doing so without the problem behavior present could back fire on you and create a digger.

Kongs are wonderful as boredom busters. Make sure you get the right size for your pup to handle. One size does not fit all. Cubes that you put kibble in and it falls out as the dog rolls the cube are fun for the pup too. I use the cube in the crate to create two fold results. 1. It helps to discourage the pup from feeling anxiety when I leave. 2. It helps pup to learn to love his crate. I put the cube in the crate even when I am home occassionally and leave the door open.