Answer:
Looks like water, but it's heat. Sits on sand, lays on concrete. A play on the eyes, but it's all lies.
We are all around, yet to us you are half blind. Sunlight makes us invisible, and difficult to find.
What letter comes next: O T T F F S S ?
What has six faces, But does not wear makeup. It also has twenty-one eyes, But cannot see?
I am free for the taking. Through all of your life, though given but once at birth. I am less than nothing in weight, but will fell the strongest of you if held.
This food is a tortilla filled with cheese and sometimes chicken before being heated or cooked.