Gift Card Challenge

Since I just moved from one side of town to the other, I am changing pharmacies. I don't feel any particular loyalty to any one store, so I am going to go with Homeland (for now) which had a coupon out for a 30 dollar gift card with a new or transferred prescription. I don't like Homeland all that much, but they do sometimes double 1 dollar and occasionally 2 dollar coupons, so I keep an eye on their sale ads. How many groceries can I get for $30? We'll see how this goes!