>>1405438The World Health Organization recommends that adults should at most consume no more than 5g/day of salt, the equivalent of 2g/day sodium. This is a conservative estimate against an actual average intake of 9g/day+ of salt for the average adult in western society.
Technically you don't need salt in the diet at all, the nutritional minerals in salt the body needs, sodium and chloride, is easily sourced from other foods, and has the advantage of not coming in the ionic forms which salt comes in as part of being dissolved in a solution, which is where detrimental blood pressure effects of salt stems from.
In my opinion, salt is best reserved for food preservation purposes, but otherwise it should be avoided if possible.
In my experience, cooking 1 cup of rice(240ml, or roughly 150g) can be done with as little as 2 cups of water, or 480ml. 480ml of seawater contains 16.8g of salt on average. Depending on your physical size and activity, and what else you consume, you will need anywhere from 2 to 4 such rice portions a day to keep your energy levels up, putting your daily salt intake between 33.6g/day and 67.2g/day.
So conservatively speaking, you will be getting more than 6 times, and up to 13 times, the recommended maximum intake, or between 3 to 6 times the average western adult consumes.
As others have pointed out, the amount of clean water you would need to drink to counteract the detrimental effects of such a high salt intake would be much more than the weight you would save by not carrying cooking water with you and using seawater instead.
Keep in mind the symptoms of salt toxicity, something you will almost certain experience after sustaining such high levels of salt intake for several days, include: "...a strong feeling of thirst, followed by weakness, nausea, and loss of appetite. More severe symptoms ensue, including confusion, muscle twitching, and bleeding in or around the brain. Death results by the swelling of the brain against the skull."
