Hi Bernadette,
Here are some tips which I got from my gynae:
1. Wear 100% cotton undies.
2. Avoid wearing tight bottoms.
3. If you are used to wearing pantyliner, you need to change them more often.
4. If possible, try not to wear undies when you sleep. Basically, to air your nether region.
5. Wash your undies and towels (basically any thing that comes in contact) in hot water.
6. If you have unprotected sex, your partner will need to be treated too. Otherwise, the infection will just be passing between the 2 of you.
7. Cut down sugary foods.
Hope this helps.