I agree with replies above. I just wanted to throw this diet in for consideration. www.thepetglider.com/pages/the-glider-nutrition-system
You need to get their vitamins from their store. Its about $50 for a 1 year supply for 1 glider, so a half a year supply for 2 (It is highly recommended to have at least 2).
Once you have the vitamins, everything else is store bought. Fruits, veggies, yogurt, applesauce, and protein. You can make a months supply in a few hours for ~$35. Then you freeze it into ice cubes and thaw out one per glider sprinkle some vitamins on top and set it out for them everyday.