This is what I have done for my son. Same prescription for you.
1) Take your shots. Typhoid etc. Some shots are needed a month ahead of the visit.
2) Mum or no Mum, make sure you boil your water, milk, utencils.
3) Take Pepto tablets with you when you go for wedding receptions etc.
4) After taking all precautions, all you have to do turn to your lord and inshallah you will be fine. And then if you still get sick, know this, it is a test which can be blessing in disguise.
The Weak can never forgive. Forgiveness is an attribute of the Strong." - Ghandi.