You only need your own supplies for the first 220km. After that the controls in my experience worked well for food. Unfortunately a lot of the food is beige and the third of a cup of coffee they offer you isn't great. I wish they could do a large mug of tea, that's what I craved for in the mornings.
Un flan in a boulangeries is my favourite. Two on the way out, 2 on the way back. Also had a couple of cheeky halves in a bar and a roll up a drunk offered me.
Controls also offer a chance to mingle with people and each one is different. You will feel better getting back on the bike.