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The hydrophobic properties of the OP are from a cushion of air. So whatever you're keeping in the bottle shouldn't degrade when exposed to oxygen for that to work.

There's no reason why it'd have to be in air for it to work. Food is regularly packaged with nitrogen or argon to keep it fresh. Google "modified atmosphere packaging" for more.

Is the surface tension of water different when in the presence of different gases?

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