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Published 10:24 11 Aug 2016 BST
Updated 10:26 11 Aug 2016 BST
The germ riddled bottles are caused by a lack of washing with many people refilling their bottles numerous times without rinsing them thoroughly or running them through the dishwasher.
This is rather alarming when you consider that 60% of the germs found by researchers in this study can make a person sick.
So do yourself a favour, wash that bottle you filthy animal.
You can also check out this handy infographic on running injuries and how to treat them.