not just salt
It isn't just salt (sodium chloride) that you need to replace but calcium (causes cramps) and potassium (causes muscle weakness and constipation).
A simple visual check to see if you are drinking enough (or if you forget to count the volume) is to monitor your urine output and its colour. If it's dark in colour (darler the worse it is) then chances are you are dehydrated.
It is considered best practice to drink small amounts very often during the day rather than one huge dollop which doesn't have enough time to hydrate you properly before it is expelled.
A good watering before going to sleep and early in morning help too.
If in doubt- get advice from your medic.
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