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As long as the water you are filling it with is clean, it won't be the problem. What may cause an issue is your mouth. Human mouths are not especially clean, and while microorganisms are kept at ba...
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#1: Attribution notice removed
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System
·
2020-05-27T11:08:45Z (over 4 years ago)
Source: https://outdoors.stackexchange.com/a/6905 License name: CC BY-SA 3.0 License URL: https://creativecommons.org/licenses/by-sa/3.0/