I'm going to keep things super simple and boil your nutrition tips down to just two. And they both have to do with drinking.
1. Drink more water. Drink it constantly. Just sip at a water bottle all day long. Keep it fresh by opting for fruit-infused or sparkling varieties. Water keeps you hydrated, helps stave off false hunger pangs, keeps your metabolism revving at its optimum level, and keeps your mouth occupied. All good things.
2. Don't drink your calories. I know you've heard it before, but if a beach trip is on the horizon, now is not the time to consume a full day's worth of calories in liquid form. A 500-calorie coffee in the morning and a 500-calorie margarita at night, bookending your well-meaning juices, full-fat dairy, and (gasp!) soft drinks sprinkled throughout the day, do not a happy body make. Liquid calories don't fill you up, which means you're still going to end up with the munchies. Stick to water (see tip #1), black coffee, and plain tea.