The issue is not the product, but the packaging and the volume:-

If you buy "gasoline" in the supermarket in 1 litre bottles, it DOES cost around the same as bottled water. For example, camping fuel or paint solvents cost more than bottled water.

If you buy Red wine in a French Hypermarket, one option is to bring your own container and fill-up with vin de table from a machine just like a petrol pump. Unsurprisingly, that costs less than bottled wine, or water.

If you buy water by the tankerload, it's WAY cheaper than a tankerload of gasoline.

if you buy milk in 1/4 litre containers, it is way more expensive than gasoline. In 3-litre bulk packs, it is comparable in price to bulk gasoline.

Dry goods are similar. Individual servings of breakfast cereal are ferociously expensive, but a truck-load of rolled oats is literally chicken feed!