For breakfast- Make yourself a nice banana smoothie with milk. You could also add blackberries, peaches, and strawberries- all are fruits with high potassium content, and they are great in smoothies.
For lunch- Enjoy a fresh spinach salad with tomatoes, turkey, bell peppers, and fresh mushrooms. The key is to keep away from the pre-made stuff. Keep to fresh ingredients whenever possible.
For dinner- You could make a nice roasted chicken and serve it with lima beans and green beans.
For dessert- Throw together a fruit salad with grapes, blueberries, apples, oranges, and raspberries.
For a snack: Keep a banana in your desk at work for a super charged potassium snack (400 mg) with low calories (80 per banana).