the p90x nutrition plan

Question about P90X Nutrition Plan!?
Alight I just got P90X for christmas. I have been wanting to start the 90 day program but one thing is wrong. I want to follow the nutrition plan, but unfortunately I can’t afford all of the stuff at this time. What would you suggest I do?
Replace the food you can’t afford. For example if lunch says have a piece of fish replace it with chicken. Make sure you measure out everything and remain within the same macronutrient ratios.