1 cup of almond milk uses more than 101.2 Gallons of H2O and releases more than 3 lbs. of CO2 into the atmosphere. To produce regular milk, cows drink 30 to 50 gallons per day to produce milk and oat milk, may seem like a lighter option, but it takes about 145 gallons a simple cup.
Source: IX Water & 8billiontrees.com