What is black water? Does Malaika Arora drink black water?

Post a yoga session last week, Malaika Arora was clicked by the paparazzi carrying a water bottle with black liquid in it. What is black water?

Celebrities have always been among the trend-setters and it hasn't changed this time as well. Recently, Malaika Arora was spotted post her yoga session in a black crop top and shorts. But what was eye-catching was the water bottle she was carrying, with black liquid in it. So, what is this black water, you ask? WHAT IS BLACK WATER?