Since your spouse has sodium issues...and I don't think you have a kitchen (so no real fridge/cooking?)
I would get
- salt-free peanut butter (like this one
https://www.walmart.com/ip/Crazy-Ri...MI1ePU4MHk4wIVh5OzCh2U5QvlEAQYAiABEgKmNvD_BwE)
- a jar of nutella
- a bottle of honey (shelf-stable and goes in everything)
- a bag of apples
- a bag of bananas
- a bag of clementines
- a loaf or two of low sodium bread and/or a box of low sodium crackers
- a box of instant low sodium oats
- a bag or two of dried fruits (what you like to snack on in trail mix and/or put in oats) - just make sure they don't add salt to dry them...
- no salt pretzels
- no salt pistachios or almonds (again, what you like in a snack mix or on oats)
- single serve bottled juices and milks - juices should be zero - milks will need checking
- a box of plastic utensils, a set of paper bowls (which can serve as plates or bowls), and a box of ziplocs (to bring to the park)
So, I'd avoid lunch meats (sodium is almost always too high), convenience cheeses (salt levels), single serve packaged convenience foods (again, sodium), microwave meals, etc...
I'd integrate the ingredients above all over the place - but you should have a good healthy base of proteins, fats, and vitamins at a low salt level that should help if you start getting too much salt in parks...