Having a designated snack bag can be helpful to add extra storage volume. Keep this bag handy so you can get to it quickly during the day. If you use Mountain House meals, those take up a lot of space. Six of the "2 person" meals would fill a third of my pack. Might need a bag just for those.
The large dry sack from the Walmart 3 bag assortment holds 5 days of food for me, with a little spill over. 6 would be really tight. So much depends on exactly what you want to eat and how much are you willing to skimp.
Most section hikers hit the trail well feed, if not overfeed, so you tend to have decreased appetites for at least the first few days. Many short-ish section hikers find they packed way too much food.