Hi Geoff,
You're in for lots of treats but there are many days where you will find no cafe, shop or bar from beginning to end of the day. That is why I recommend staying in gites where you can have demi-pension, (bed breakfast and dinner) as the meal served up in the evening is usually great, home cooked and generous; big tureens of soup, lovely home-made pates and terrines, etc. Breakfast is fairly basic but better to have it as you may not get another coffee all day.
Most towns have markets some day in the week but it's hit and miss as to whether you will be there on the right day. Lots of good local cheeses even in small supermarkets and plenty of ham etc.
As well as pig parts, I hope you like duck. After our second section, Conques to Condom we came home quacking! Duck, duck and more duck, but it was wonderful.
Don't miss the wonderful tarts at the cafe in the village of Aubrac. Lovely salads with Roquefort and walnuts in the Conques area.As you arrive in the basque area piperade becomes the order of the day with everything.
The great part is that with all the walking you can eat all these goodies with no fear of putting on weight!
PS Demi-pension meals almost always include wine.
Enjoy, and bon chemin;
Anna