It has "hardly any cals" because water has no calorie value.
http://althealthworks.com/5907/how-...contain-industry-insiders-shocking-admission/
"If you’re currently drinking a glass of fresh almond milk, you may want to put it down, because this may actually infuriate you: it turns out that a half gallon carton of almond milk contains less than handful of almonds.
To be precise: one analysis of UK almond milk brand Alpro revealed that almonds only make up 2% of the total drink.
And when it comes to big brands in the U.S. whose bottom lines are skyrocketing, the formulations might not be a whole lot different: one spokesperson for the Almond Board of California said that ingredient combinations are “pretty similar” among UK and US almond milks in this article from Business Insider.
You read correctly, only 2% of almond milk is almonds. I think a more appropriate term should be “colored water that may contain a hint of almond.""