To make this Grilled Chicken Pita gluten free, replace the pita breads with certified gluten-free pita, gluten-free flatbread, or serve the chicken and toppings in a bowl over rice, quinoa, or lettuce. Also check that the soy sauce is gluten free, or use tamari instead, since traditional soy sauce often contains wheat. Verify that the bacon, feta, yogurt, olives, and any packaged ingredients are labeled gluten free, as brands may vary or be processed in shared facilities. For anyone with celiac disease or severe gluten sensitivity, use clean grill grates, utensils, cutting boards, and serving dishes to avoid cross-contact.