According to this: https://foodprint.org/blog/plastic-water-bottle/ https://foodprint.org/blog/plastic-water-bottle/ it costs about 5 liters of water to make on

According to this: https://foodprint.org/blog/plastic-water-bottle/ https://foodprint.org/blog/plastic-water-bottle/ it costs about 5 liters of water to make one plastic bottle, so based on that, yes, it wastes a massive amount of water.