I'm going camping but i have hypertension, so what foods should i bring?

I'm going camping but i have hypertension, what are some foods that will last for awhile and not have much sodium? i usually eat salads and small portions of meats. but i noticed that if i leave the salad bag opened by a little bit it becomes brown fairly quickly.

i thought about buying foods that are sun dried that are in bags but those usually have tons of sodium or preservatives that are unhealthy. i don't know how to make sun dried fruits and nor do i have the time to make them. i'm just looking for foods that don't have lots of sodium (salt) that can last for days.

What i'm leading to say is how is it possible to eat healthy foods that will last for days in a storage container?
I would like to mention, foods that are canned have high preservatives and still have lots of sodium compared to natural foods that last longer. like someone mentioned peanuts that are unsalted last longer and don't require crucial packaging. i can understand that canned foods have come a long ways of become "healthier" but i still refuse to eat canned foods. thanks for the replies so far.