If you are drinking the 3-4 litres of water a day you probably dont need any extra salt. BUT if you are drinking more than this you probably DO need extra salt as your body dilutes the salt down. Too much water will dilute and remove the salt from your body. Salt is not evil, but MUST be taken in the appropriate proportions. There was a triathelete recently who died becuase his kidneys failed due to excessive exercise in extreme heat, drinking loads and not taking on any salt, he literally flushed all of the salt out of his body and caused acute renal failure - and he was mega fit!! Salt is not evil, but if you are drinking the right amount of water, you do not need extra. That said, there can be no harm in a small amount as seasoning to taste.