Question: how much water does it take to make oat milk?
Answer: Greenhouse gas emissions: a 200ml glass of oat milk is responsible for around 0.18kg of CO2e. That's slightly more than almond milk, but less than soy or cow's milk. Water: a litre of oat milk needs about 48 litres of water produce. In terms of water, then, oat milk is much lower impact than other milks.