In lazy with mixing my water. I've learned roughly how much gives me the salinity I want and dump it into a bucket. Pour the water over top and stir with a wooden spoon. Let it sit until a day before my water change, which is about 6 days, and mix it again before checking the salinity. It usually comes up 1.025, but if too high give it some more water or salt if it is too low. Do the water change the next day.