There will most likely be a lot of Lao food.
Lao food has a wide range of specialties that you should try, but if you are not an adventurous eater then it is better stick to noodle soups and crackers.
Places like Luang Prabang, Luang Namtha and Nong Khiaw, Vang Vieng all support a good range of western food, should you feel like it.
Some of our motor bike tours in northern Laos involve staying in remote villages with no restaurants at all. During these days we will arrange for a family to prepare a meal for us.