I use Nalgene bottles, they're stout and don't easily grow things. I had an old water bottle I used...had it since '84 or so...left it in my coffin (surfboard bag that holds 2 boards) with a mix of whey and gatorade in it. Discovered it 2 months later, it had "expanded". Took a bit of hosing with a dose of bleach to kill that smell.
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