sorry bro.
capitalism is strictly a fiscal policiy and an economic principle.
Socialism, and in fact the whole of marxism is an economic theory, and a political theory operating in tandem.
much in the way islam is both a religion and a political movement.
and so is judaism.
and so is "dominionism" in christianty, and so is catholicism, etc etc etc...
capitalism is the idea that items have intrisic value based on Utility and desirability, and that value is modified by Scarcity.
EVERYBODY needs water to live, but everybody does not have a well outside their back door, or a river or lake in their back yard. as such somebody has to bring water to those who desire it, or offer it up from a central locartion
in ancient rome, water was free to all, from public fountains brought in at government expense through taxation. the apparatus and infrastructure of the water's transportation was paid by all, rich and poor and arrived in common fountains where all received the benefits. this is a Communal program, in that it is for the benefit of society as a whole, since a city without water is a ghost town. nobody sold water in rome, since it was FREE TO ALL, and you cant sell free stuff except to dumbasses. Unfortunately being free, everybody simply assumed the wells and fountains would tend to themselves, and the shit became raggedy and disgusting in short order. so the senate established that public houses bars and bath house operators would have to maintain the wells and fountains near their establishment as a part of their Civic Obligation. the abuse of common resources by the least conscientious (washing your laundry in the fountain basin where everybody draws their drink, shitting in the fountain, dumping trash in the fountain etc...) is the Achilles Heel of communism
in modern america all water is delivered directly to your house as part of a utility system where water use is metered and billed by usage, or assessed as a flat rate to all homes recieving water service. This is a capitalist system, since the water is delivered based upon your paying the bill. if you dont pay, your water gets shut off, or it is sold in plastic bottles at a criminal markup by dingbats who inform you that municipal water is poison, and their shit is awesome. thats Capitalism's Tradeoff, We are subject to Marketing.
in some municipalities, even if you have your own well you are still REQUIRED to have municipal water service, and you still get a bill every month for that service even if you do not use it. That's the ugly bastard child of Capitalism and Communism, Socialism. Socialism tells you what you may have, what you MUST do, and if you dont like it, theres always the Gulag. Socialism promises the same ideals as Communism, but invariably the apparatchiks live in Dachas on the black sea, and the plebs live in 12 story walkup apartment blocks riddled by crime hunger and desperation. Corruption and Self-Enrichment is the downfall of Socialism.