I think the dl means deciliter which is roughly 3 ounces. (very roughly) If you type the conversion you want into google search it will give you an exact answer.
https://www.google.com/#q=1+dl+in+ounces
nightquilter please don't think I was criticizing your statement, I just find it very interesting how differently we all react to the gluten free products. I have frequently recommended products to people who thought they were awful and vice versa. It is still good to get those recommendations, it gives you somewhere to start.