washing out vitamins and minerals?

I have been on the Water Cure for two weeks, and am definately feelig better. I have more energy, and I am pretty sure I am sleeping better. Early days yet though. I would like to know if because I am drinking four litres of water, and taking 1/2 teaspoon of Sea Salt a day, am I washing out vitamins and minerals out of my body? I take supplements every day, but am concerned they are being rendered useless. Thanks. Tweet