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Hopefully mostly water. It also contains dissolved minerals and gases. Precisely what minerals and gases and in what concentrations depends on where it came from. It probably also has some kind of chlorine compound, and may contain a fluoride; these will have been specifically added by the water treatment plant. If you really want to know what your tap water specifically contains, contact your local water treatment plant or utility company. They'll have a long list of various ion concentrations and whatnot from the last time they tested it (which they're required to do periodically, at least in the US). They may not be able to help as much with gases, since that depends on the temperature and can vary considerably.

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