It is possible that you have misread the article that you have referred to. Plastic bottles that you buy from the shop containing water are only meant for single use. For many years there has been warnings about constant reuse of these because the plastic quickly degrades. Advice seems to suggest that 4 or 5 refillings is ok, but even so I would suggest that there is a bit of scaremongering about this.
Why not buy a water bottle that is designed for the purpose from a sport or camping shop ? These will last for years and usually stand up to any amount of hammer from kids.
You should also remember that, as with any other food or drink container, that it will need cleaning thoroughly periodically.