Insanity workout nutrition question?

I'm 19 years old, 5 foot 8 inches tall and weigh 65 kg (143 pounds). I just wanted to know, it's hard to do the 5 meal diet and the nutrition plan meals because I'm a student and my mum makes lunch and dinner. I was wondering, can I have 3 meals a day, which snacks in between (fruits etc) as long as it adds up to the calories that is required?