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Salt tastes biting, puckery, savory, zesty, piquant. Salt tastes like any of numerous compounds that result from replacement of part or all of the acid hydrogen by a metal or a group acting like a metal. Directly on the tongue, salt tastes biting and puckery. In your eye or on a broken skin part it can sting fiercely.
Water usually has some minerals and ions in it, and yes, you can taste those. Mineral water has more of them. Some products, like Dasani and SmartWater, are designed with a specific ion balance, which causes a slightly sweet taste. Ordinary tap water has much of the same minerals and ions.