My doctor started me on a generic of accutane yesterday but next appointment isn't until 8/9 and I will run out of meds?

You will be fine going without medication for a few days. So long as it isn't more than 10-14 days the medication will still be effective. Remember that accutane is a medication that needs a total dosing over a number of months to work. The second part of your question is EXTREMELY important. Accutane is a medication that requires fat to be absorbed. You don't need to eat a McDonalds cheeseburger with it, but some fat is of utmost importance. I routinely recommend a teaspoon of peanut butter for this purpose.