Mix together all the ingredients except the water.
With a wooden spoon, start mixing the batter adding slowly the water until a soft but not sticky dough forms.
Knead with your hands for just five minutes and then let the dogh rise in a covered bowl inside a turned off microwave for 1 hour or until doubled its size.
After it has doubled its size, knead the dough just for a couple of minutes and then lay it in an well oiled baking pan.
Cover the baking pan and let rise for another hour.
Spent the other hour, sprinke olive oil all over the risen dough and make "dimples" with your fingers.
If you are making just the focaccia, bake it in 200 Celsius for 25 minutes(depending on the size of the baking pan) or until golden brown.
If you are turning it into a pizza, after you make the dimples, spread the marinara sauce evenly and then add the Mozarella, pepper, olives or everything else you like on a pizza.
Bake at 200 Celsius for 25 or 30 minutes or depending on the size of the baking pan, until the mozarella is melted completely.