In addition to the TIW discount already mentioned (which I recommend), you can also buy a discounted
DDP with your AP. Since you are booking the one separate week with the additional people. It would work out better. But get the cost first & then figure which way would be best for your situation.
Call the Annual Passholder line and give them your ressie # for the one week and advise them you have other non-AP guests with you, but you want to purchase a DDP for all. They will give you a discounted rate for the DDP, but the only drawback is that one of the persons that holds the AP will have to be there to purchase the meals.
For the rest of the time your are there, get the TIW card for a 20% discount.
For places like T-Rex, Rainforest, & other non-Disney restaurants, they will usually give a 10% AP only discount.
As of now, but I don't know if it is going to be a permanent thing, your AP gives a discount at most all Disney shops & stores. The discount is 10% for a standard AP and 20% for a Premium AP. That includes even food items at the Trading Posts. Make sure you bring your Driver's license or picture ID, because they will ask for it.
The TIW discount is also good at several non-table service locations, like Pizza Planet at Studios or the Flame Tree BBQ at ANimal Kingdom. Also, those resorts (like Pop Century) that have only a counter service system, they will also give 20%.
Always ask when making any purchases anywhere, if they give an AP discount. It never hurts to ask.