I drink 64 0unces of water daily. 4L is 135 ounces which is an abundance of water. I could not possibly drink 4L. I checked Inernet for the conversion. Liters drives me nuts since I am 95 years of age. I understand someone is trying USA to use Liters instead OF OUNCES. Good luck to them, I am sticking to ounces. What is your age if u do not mind my asking???