The correct way of making a solution of acid in water is to

Adding water to acid causes an exothermic reaction which produces a lot of heat. And it may lead to an explosion. Therefore, we should take excessive amount of water in a large container and mix acid to water drop by drop. This process will cool down the heat generated and could prevent danger.
Mixing acid and water at the same time will result in spluttering of water or acid that may cause burns.