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Not a solution in itself, but pushing the "unusable" point somewhat further: Carry the bottle (preferably in thermo sleeve, and with warm/hot water at the beginning of the tour) upside down. This...
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Not a solution in itself, but pushing the "unusable" point somewhat further: Carry the bottle (preferably in thermo sleeve, and with warm/hot water at the beginning of the tour) upside down. This...