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As we know that acid reacts with water so.......if we add water to acid then heat will form and may harm us 

When you add water to an acid, a small amount of water added in at a time increases greatly in temperature, meaning a chance for that water to quickly evaporate and make the acid be pushed out of the way by the rising gas.
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Adding water to acid is a really exothermic reaction. It can release so much heat that the glass of the test tube may even shatter. The content of the test tube can also splash out and cause burns. So, it is always recommended to add acid to the water slowly with constant stirring.
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