I don't do anything special. If I'm thirsty, I drink water and I assume my body knows when it needs it. If the urine is completely clear, then I know I drank too much water.

In the first few months of eating low carb, I heard all the scary stories about keto-flu so I purposely drank more water than usual (and salt) but started feeling dizzy all the time whenever I got up from a lying position. Once I stopped drinking all the extra water, the problem quickly went away.