if you suffer from PCOS, I recommend switching to whole grain carbs and avoiding white carbs altogether as they have been stripped of all their goodness and will leave you feeling bloated. Potatoes are the worst one for me, I really have to limit the amount I have.
Also plenty of water is definately a good idea, avoid fizzy drinks and too much caffeine.
If you can bear it a cup of hot water every morning before you eat, will help. You can add a slice of lemon if you find it hard to drink.