As noted, I try to stay under 1500 mg a day myself. What those who don't watch sodium intake don't realize is that sodium is only one thing you need - going hiking is not an excuse to load up on salt. Your body will tell you if you need more - our kidneys (when healthy) reserve just what we need (Isn't that awesome?!) so excess sodium is purged out, making it hard on our kidneys.
But! One thing to watch is to get a wide range of nutrients especially potassium rich foods (unless you are on certain BP meds where potassium is not desireable, a few do that.)
For me, I would feel blechy back in then day, nauseous, unable to think clearly, no appetite, bad cramps, etc - when I was dehdyrated. Later on I found out my body was stripped of potassium. So now I carry dried bananas, lightly salted kettle potato chips, green veggies dehydrated, etc. If one wants to feel better on a hot day, when you take a break, eat 1 ounce of potato chips (all natural, less than 80 mg sodium) with your water. You will get a tiny jolt of sodium, a lot of potassium and it will help you deal with the water coming in. That little bit of sodium will encourage you to drink more. The potassium will help protect your body. (Potassium helps regulate how you use sodium)
With sodium...a tiny bit is all you need. You don't need a hit of 800 mg in a serving!
And also, you can get a number of tasty drink mixes that are lower sodium - just a hint, but not too much