Efran has done a YouTube series and has made excellent notes for all toilets and water points of which there were many. We have just finished walking from Le Puy to Cahors and had no problems finding water or toilets but don't expect to find any shops selling anything much let alone water. There will be the odd cafe, boulangerie and if you are really lucky, an epicerie or a boucherie but it is best to get a picnic from your accommodation if they offer one as that is usually a good indicator to expect little ahead. If there is a shop, don't forget that it will be closed on Sunday and Monday, for lunch from 12 - 1:30 and on random days like a Wednesday or Friday (usually the day that you are walking through) and all public holidays which for us was 1st, 7th and 18th May. I think that was only about 5 days when we were able to get any food on the trail.
The Podiensis is not just a pilgrimage route but it is also part of the Grande Randonee network of walking routes so there are lots of people, mainly French, walking who are not doing the Camino, and during April/May they were out with their families and friends walking week-long sections and staying in the gites and guest houses.