Please drop the low-fat idea, it's crap, and unhealthy. Low-fat candy bars? So you should survive on pure refined sugar!
Base your diet around lean protein, lots of vegetables, nuts, seeds and healthy oils (olive, canola, avacados etc.) fewer fruits, little starch (bread, potatoes...limit or exclude them completely) and no sugar.
Eat 5-7 meals spread evenly throughout the day, each balanced with a bit of each of those elements. Kiba was right about the water though, drink as much as you can tolerate. You could easily get away with a gallon a day!