@Amadis It is not a wilderness hike. It is Europe in summer. It is basically a hike from village to village, from café to café. There are shops everywhere. Supermarkets, groceries, bakeries, patisseries, restaurants even.
If you want to keep down the $ do not discount staying in albergues. You may be surprised. And if you are travelling as a couple you will also find that a private room is very affordable - and will probably not be advertised on booking.com or other commercial sites. Do not be misled by Pamplona at San Fermin (personally I would avoid it like the plague, but that is a personal thing) when prices reach ridiculous heights. Try searching this forum with the tag "accommodation" to get ideas.
In July on the CF it can be hot. You will need very little and should be able to keep your packs down to under 8 kilos each, including pack weight, water and snacks.
My go-to packing list for July is as follows:
Walking skirt or pants - ONE or the other, not both.
Walking shirt (light but long sleeved, for sun protection)
Hat
Umbrella (sunshade and rain)
2 pairs knickers and bra
A skirt or pants and top for evening and when hiking clothes are being washed. On some caminos I have swapped this for a lightweight dress.
1 fine merino wool cardigan, black Icebreaker long johns (footless tights).
Altus poncho.
Walking sandals (I walk in sandals).
1 pair fluffy striped socks from the $2 shop - to put on at night if my feet get wet and cold during the day. Weight - nothing.
Crocs for the shower and to give my feet a change from the hiking sandals.
Nightdress or silk knickers and top (I don't like wearing clothes to sleep)
Swimmers.
Lightweight cotton sarong - to sleep on, to use as a towel, to use as a modesty skirt over swimmers.
Minimal spongebag - soap (multipurpose - hair, body, clothes), hair conditioner in a tube, toothbrush, tiny toothpaste, anti-chafe cream (doubles as anti-perspirant deodorant)
Moisturising sunscreen (small)
First aid kit - tweezers, scissors, needle, antiseptic rubs, tape, pyrethrum spray.
1 lightweight hiking quilt (instead of a sleeping bag)
2 x 600ml water bottles.
If I was wearing shoes I would also need several pairs of socks.
Buen Camino!