Eat, drink, and be merry
The food in Ghana is delicious! The menu often revolves around rice or another starch like a pounded dough that you dip into soup or stew. There is a lot of chicken, tilapia, and some beef and goat. Beans are almost always on the plate along with any type of plantain that you can imagine: fried, roasted, in chip form, double fried, sweet or salty. Beware - the food is usually spicy!
Many students in the program are kosher, vegetarian, and even vegan. If you have such a diet, you will be able to follow it fairly easily throughout your stay. Let those in charge of the meal plan know about your dietary restrictions, and they will be happy to accommodate you.