I've been wanting to try this, but I don't know how flavorful the coffee would be. I found a recipe that says to boil water mixed with Bustelo espresso, then run through a cheescloth or any other type of clean cloth. Does anyone do this? I remember growing up in the Bronx seeing how some of my friends moms did this for their daily coffee. How long can this prepared coffee last? I want it primarily for cafe con leche, and am looking for the best taste.