Right after we got dropped off by our driver to explore St.Tropez, we wanted to find some…read morebreakfast. So we stopped by this grocery store to find some pastries and other morning goodies. Casino Shop/Supermarche is a French national chain of grocery stores similar to Albert Heijn in the Netherlands and Walmart/Meijer/Kroger in the United States. Just like a Walmart, they have different brands for their subsidiaries with Casino Shop equivalent to a regular-sized Walmart and a Casino Supermarche analogous to a Walmart Supercenter in addition to a few other brands.
This was a smaller branch and we ended up getting a 1L bottle of water for 38 cents (in Euro) . Groceries in general seem to be very cheap and water is dirt cheap. Trying buying bottled water in a restaurant and you'll get fleeced. Might as well get their cafe, soft drinks, or specialty drinks like cocktails cause they'll probably be the same price.
If you're not a local and living in France temporarily or on vacation for an extended period, get used to seeing these and shopping there. They're basically everywhere!!