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. If you forget to release the pressure on the bottles it can be really messy, even plastic bottles can explode. You can get 5l bottles of mineral water for £1. Drill or melt a hole in the cap and use a grommit to make a place to put an airlock. Can also just stuff with cotton wool. Either that or go to Wilcos and get some demijohns. If you do go down the pop bottle route, just use cotton wool instead of the lid until fermentation is over.