All you need: 2 beefsteak tomatoes, fresh basil, sliced mozzarella cheese and balsamic vinegar. Slice the tomatoes and layer with the basil and cheese.
Place in a ziplock bag or other container and add a few tablespoons of balsamic vinegar as a marinade.
You can put this together before you leave for a weekend and just throw the bag in the cooler or refrigerator until you are ready to eat. When you take the "sandwich" out of the bag, all you need to do is arrange it on a plate. The marinade can be drizzled over the top for more flavor. The cheese takes on a meaty texture when marinated. So, if you can slice a tomato, you can prepare this meal.
This is one of our favorite meals, especially when paired with a glass of wine. I feel so accomplished when I can present a fancy looking feast while floating on the lake with no electricity or refrigeration.