O.K. I take it that all of the flies got drowned in the culture in transit. From the time that the eggs hatch until the "worms" (gusano) pupate is about four days. By now, some should have climbed up the sides of the pot and formed small dark brown pupae (ninfa dormido?). They will hatch into flies after about five or six days, at 80F (~30C) which I think is about the temperature of your peninsula. Don't put them outside, just keep them where it is warm and bright, inside. They won't hatch any faster if you raise the temperature.
The tiny fruitflies, are called Drosophila melanogaster, in case you need to buy any more, and the larger are called D.hydei
A post by Katt reminded me of you a few days back. She mentioned using a small, fine mesh net used in fish tanks, and since you have a tank, you may have one. In the US they are almost always green with a twisted wire handle. Just go out where there is a lot of grass and sweep the net though it a few times, and with luck you should find some tiny insects like leafhoppers, which make good nymph food. Keep trying, don't give up!
One more thing. You said that you were unable to catch fruit flies with a light at night. Put a piece of that vinegar bread on a plate in your kitchen in the daytime. That always works for me.
Good luck, and let us know how it turns out!