You want to drink water whenever you are hungry, because half of the time you think you are hungry its actually thirst because they use the same receptors.
Stay away from empty calories, soda, sugar and fats and crap will taste delicious, but does nothing to your body other than give you a temporary sugar rush and then crash.
Personally while losing weight up to recently I lived off of dominos and burger king $1 menu off and on. with anything related to weight loss portion control is everything, So when i would buy from those fast food delivery places I would buy a lot at once and try and make it last as long as possible, easting a slice or 4 per day sometimes eating other food, make sure your intake is minimal, You can live for what like 12 days without food, so ease yourself off of excess food and sugary shit and weight loss just happens naturally. Also you want to shit more if you don't already take at least 2 shits a day on average, eat at least some salad and or vegetables and fruits every week, nuts, meat and protein in general, yogurt, easy healthyish grab and go shit like cliff bards and fiber one bars, an apple, orange other fruits, all those together are easy healthy ways to snack all day and keep your metabolism going and the shit flowing. once you do shit 2-5 a day its fucking amazing, cleans you out and puts a spring in your step meaning your metabolism is working burning calories all day not just around meal time.