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It's hard to keep a cooler or picnic basket perfectly stable. Everything is going to get a bit jumbled so skip things that require perfect presentation, such as deviled eggs or even birthday cake. Instead, try more humble foods like boiled eggs, potato salad, cheese and bread, or carrot sticks. Don't pick foods that require a knife and fork to eat. Choose foods you can eat with your fingers or just a single utensil. Too much fussiness makes for a messy picnic.  For instance, try sandwiches, cottage cheese, or egg salad. Fruits like strawberries, bananas, oranges, or apples are also great options! You could also try things like fried chicken, cookies, pinwheel sandwiches, pigs in a blanket, or burritos. The foods should still be simple to eat, but that shouldn't stop you from catering to more adult taste buds. Plenty of foods can be easily carried and eaten by hand that are more sophisticated.  For instance, try bruschetta and toasted bread, goat cheese and crackers, or a salmon and cream cheese frittata. You could also bring a variety of cheeses or dips, along with crackers and chips. If you want to bring salads and veggie-centric dishes, opt for hearty vegetables instead of leaf lettuce. That way, you can dress it at home and not worry about it wilting. Add bottles of water for a simple fix, or you can make iced tea and pack it in reusable bottles. Alternatively, add juice boxes, sodas, or flavored sparkling water for a bit of pizazz. If you're planning a picnic for adults, you could bring beer or wine, but make sure it's allowed in the area you're going. Some water attractions don't allow glass bottles, for instance, while some parks ban alcohol altogether. You don't want to waste a whole jar of mayonnaise and mustard, but you'll likely need to toss anything you don't eat the end of the picnic. Instead, opt for small jars so you'll just have what you need.  You can also pack a small amount of a condiment in a food jar you've washed out, such as a pickle relish jar. That way, you don't have to go out of your way to buy special mini jars. Another option is to save condiment packets from fast-food places and bring those along.
Pick food that will hold up well when bounced around. Opt for foods that are easy to eat. Try fancier options if you're going on an adult picnic. Toss in a variety of drinks for hydration. Bring mini jars of condiments if you need them.