5l water bottle as demijohn

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Spring Heeled jim

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I see Asda are selling 5l water for 50p.

I'm thinking of buying one to use as a demijohn.

Question is, do I need to drill a hole in the top to fit a grommit and airlock?

Or could I get away with screwing the lid on sufficiently enough that it doesn't pop off while fermenting but loose enough that it allows CO2 out?

Cheers

Jim
 

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