If you eat the eyeballs, organs, blood, bones, brains and such of animals you won't have a need for salt or other nutrient supplements, except for possibly vitamin C.
You would starve if all you ate was the meat, especially with rabbit or vegetables. But, if you eat the parts that we normally pitch you can survive quite well. You can survive on rabbit alone if you eat the whole thing, and peoples have for centuries.
Blood and certain plants can be boiled down/ evaporated and the salt will be left in the bottom of the pan. The salt will not evaporate out. It might collect on the sides of the pot or lid from splashback.
In a wilderness survival situation I would not be too concerned with salt. Because by the time my body would need it I would have already resorted to eating pretty much the entire animal, including grinding the bones down and eating them.
In the past people even added rabbit pellets to their stews and such. It provided some kind of nutrient that they couldn't get otherwise, probably veggie based.
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