A mysterious sort of grass

I see these little baskets of grass often in the market in Bhuleshwar. Do you know what this grass is, or how it is used? I've wondered about it so often that I decided to post a photo. I'm simply dying to know!

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I have a pet theory, that these are herbs used to flavour drinking water. As a child, I remember drinking herb-flavoured water at my friend Sugatha's home. They are from Kerala, and her mom made herb-flavoured water at home every day. It looked like pale whisky, but smelled delicious and the taste? Well, it tasted like water, but you felt ever so virtuous drinking it!

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Maybe the grass in these baskets is actually a herb that goes into tea? Or maybe it is some vile concoction that you drink first thing in the morning for arthritis or diabetes! Oh, someone please tell me, and put me out of my misery!